diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9aa353a4eb..0518abb23f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # TelegramBotAPI changelog
 
+## 14.1.0
+
+* `Version`:
+    * `Coroutines`: `1.8.0` -> `1.8.1`
+    * `Ktor`: `2.3.10` -> `2.3.11`
+    * `MicroUtils`: `0.20.45` -> `0.21.0`
+    * `KSLog`: `1.3.3` -> `1.3.4`
+* `BehaviourBuilder`:
+    * `BehaviourContext` updates listening job will be weakly subscribed. It means that `BehaviourContext` scope will
+    not be prevented from cancelling by this job anymore
+    * `BehaviourContext.doInContext` will not stop automatically current `BehaviourContext` job anymore
+    * `BehaviourContext.createSubContextAndDoWithUpdatesFilter` will use `supervisorScope` instead of
+    `LinkedSupervisorScope`. That will prevent scope leaking in runtime
+
 ## 14.0.1
 
 * In `core` and `api` modules related to invoices changed their APIs to suite current API
diff --git a/gradle.properties b/gradle.properties
index bf9769c9e5..5af7457d09 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,4 +6,4 @@ kotlin.incremental=true
 kotlin.incremental.js=true
 
 library_group=dev.inmo
-library_version=14.0.1
+library_version=14.1.0
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 7bcca67082..c7e4b00f61 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -2,19 +2,19 @@
 
 kotlin = "1.9.23"
 kotlin-serialization = "1.6.3"
-kotlin-coroutines = "1.8.0"
+kotlin-coroutines = "1.8.1"
 
 javax-activation = "1.1.1"
 
 korlibs = "5.4.0"
 uuid = "0.8.4"
-ktor = "2.3.10"
+ktor = "2.3.11"
 
 ksp = "1.9.23-1.0.20"
 kotlin-poet = "1.16.0"
 
-microutils = "0.20.45"
-kslog = "1.3.3"
+microutils = "0.21.0"
+kslog = "1.3.4"
 
 versions = "0.51.0"
 
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/LiveFlowLocation.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/LiveFlowLocation.kt
index 23c8fa19ee..261d23379b 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/LiveFlowLocation.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/LiveFlowLocation.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.extensions.api
 
 import dev.inmo.micro_utils.coroutines.LinkedSupervisorJob
+import dev.inmo.micro_utils.coroutines.LinkedSupervisorScope
 import dev.inmo.micro_utils.coroutines.launchSafelyWithoutExceptions
 import dev.inmo.tgbotapi.abstracts.*
 import dev.inmo.tgbotapi.abstracts.types.WithReplyMarkup
@@ -54,8 +55,9 @@ suspend fun TelegramBot.handleLiveLocation(
     val updateMessageJob = if (liveTimeMillis == indefiniteLivePeriodDelayMillis) { // do not launch refreshing of message for indefinite live locations
         null
     } else {
-        CoroutineScope(currentCoroutineContext().LinkedSupervisorJob()).launchSafelyWithoutExceptions(start = CoroutineStart.LAZY) {
-            while (isActive) {
+        val scope = currentCoroutineContext().LinkedSupervisorScope()
+        scope.launchSafelyWithoutExceptions(start = CoroutineStart.LAZY) {
+            while (scope.isActive) {
                 delay(liveTimeMillis)
                 // Remove previous location message info to resend live location message
                 currentLiveLocationMessage = null
diff --git a/tgbotapi.behaviour_builder/api/tgbotapi.behaviour_builder.api b/tgbotapi.behaviour_builder/api/tgbotapi.behaviour_builder.api
index 17d4107dc5..7a5cf4894c 100644
--- a/tgbotapi.behaviour_builder/api/tgbotapi.behaviour_builder.api
+++ b/tgbotapi.behaviour_builder/api/tgbotapi.behaviour_builder.api
@@ -36,10 +36,9 @@ public final class dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourConte
 	public static final fun CustomBehaviourContextReceiver (Lkotlin/jvm/functions/Function2;)Lkotlin/jvm/functions/Function2;
 	public static final fun createSubContext (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Lkotlinx/coroutines/CoroutineScope;Ldev/inmo/tgbotapi/extensions/behaviour_builder/utils/handlers_registrar/TriggersHolder;Lkotlinx/coroutines/flow/Flow;)Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;
 	public static synthetic fun createSubContext$default (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Lkotlinx/coroutines/CoroutineScope;Ldev/inmo/tgbotapi/extensions/behaviour_builder/utils/handlers_registrar/TriggersHolder;Lkotlinx/coroutines/flow/Flow;ILjava/lang/Object;)Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;
-	public static final fun createSubContextAndDoWithUpdatesFilter (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Lkotlinx/coroutines/CoroutineScope;Ldev/inmo/tgbotapi/extensions/behaviour_builder/utils/handlers_registrar/TriggersHolder;Lkotlinx/coroutines/flow/Flow;ZLkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-	public static synthetic fun createSubContextAndDoWithUpdatesFilter$default (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Lkotlinx/coroutines/CoroutineScope;Ldev/inmo/tgbotapi/extensions/behaviour_builder/utils/handlers_registrar/TriggersHolder;Lkotlinx/coroutines/flow/Flow;ZLkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;ILjava/lang/Object;)Ljava/lang/Object;
-	public static final fun doInContext (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;ZLkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
-	public static synthetic fun doInContext$default (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;ZLkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;ILjava/lang/Object;)Ljava/lang/Object;
+	public static final fun createSubContextAndDoWithUpdatesFilter (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Ldev/inmo/tgbotapi/extensions/behaviour_builder/utils/handlers_registrar/TriggersHolder;Lkotlinx/coroutines/flow/Flow;Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static synthetic fun createSubContextAndDoWithUpdatesFilter$default (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Ldev/inmo/tgbotapi/extensions/behaviour_builder/utils/handlers_registrar/TriggersHolder;Lkotlinx/coroutines/flow/Flow;Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;ILjava/lang/Object;)Ljava/lang/Object;
+	public static final fun doInContext (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
 	public static final fun stop (Ldev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext;)V
 }
 
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt
index 56b3448981..1f96aef8cd 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt
@@ -87,7 +87,7 @@ class DefaultBehaviourContext(
         } else {
             it
         }
-    }.accumulatorFlow(scope)
+    }.accumulatorFlow(WeakScope(scope))
     override val asUpdateReceiver: UpdateReceiver<Update> = additionalUpdatesSharedFlow::emit
 
     override fun copy(
@@ -133,38 +133,32 @@ fun <BC : BehaviourContext> BC.createSubContext(
 /**
  * Launch [behaviourContextReceiver] in context of [this] as [BehaviourContext] and as [kotlin.coroutines.CoroutineContext]
  *
- * @param stopOnCompletion ___FALSE BY DEFAULT___. Will stop [this] in case if passed true
+ * [this] [BehaviourContext] will **NOT** be closed automatically
  */
 suspend fun <T, BC : BehaviourContext> BC.doInContext(
-    stopOnCompletion: Boolean = false,
     behaviourContextReceiver: CustomBehaviourContextReceiver<BC, T>
 ): T {
     return withContext(coroutineContext) {
-        behaviourContextReceiver().also { if (stopOnCompletion) stop() }
+        behaviourContextReceiver()
     }
 }
 
 /**
  * Creates new one [BehaviourContext] using [createSubContext] and launches [behaviourContextReceiver] in a new context
  * using [doInContext]
- *
- * @param stopOnCompletion ___TRUE BY DEFAULT___
  */
 suspend fun <T, BC : BehaviourContext> BC.createSubContextAndDoWithUpdatesFilter(
-    scope: CoroutineScope = LinkedSupervisorScope(),
     triggersHolder: TriggersHolder = this.triggersHolder,
     updatesUpstreamFlow: Flow<Update> = allUpdatesFlow,
-    stopOnCompletion: Boolean = true,
     behaviourContextReceiver: CustomBehaviourContextReceiver<BC, T>
 ): T {
-    return createSubContext(
-        scope,
-        triggersHolder,
-        updatesUpstreamFlow
-    ).doInContext(
-        stopOnCompletion,
-        behaviourContextReceiver
-    )
+    return supervisorScope {
+        createSubContext(
+            scope = this@supervisorScope,
+            triggersHolder = triggersHolder,
+            updatesUpstreamFlow = updatesUpstreamFlow
+        ).behaviourContextReceiver()
+    }
 }
 
 /**
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/expectations/Base.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/expectations/Base.kt
index 0b0eb2c008..8ad99d900e 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/expectations/Base.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/expectations/Base.kt
@@ -38,7 +38,9 @@ suspend fun <T> FlowsUpdatesFilter.expectFlow(
     filter: suspend (Update) -> List<T>
 ): Flow<T> {
     val flow = allUpdatesFlow.map {
-        val result = safelyWithResult { filter(it) }
+        val result = runCatching {
+            filter(it)
+        }
         if (result.isFailure || result.getOrThrow().isEmpty()) {
             if (cancelTrigger(it)) {
                 cancelRequestFactory(it) ?.also {
@@ -47,14 +49,20 @@ suspend fun <T> FlowsUpdatesFilter.expectFlow(
                 }
             }
             errorFactory(it) ?.also { errorRequest ->
-                safelyWithoutExceptions { bot.execute(errorRequest) }
+                runCatching {
+                    bot.execute(errorRequest)
+                }
             }
             emptyList()
         } else {
             result.getOrThrow()
         }
     }.flatten()
-    initRequest ?.also { safelyWithoutExceptions { bot.execute(initRequest) } }
+    initRequest ?.also {
+        runCatching {
+            bot.execute(initRequest)
+        }
+    }
     return flow
 }
 
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/BusinessConnectionTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/BusinessConnectionTriggers.kt
index 68c0386e46..d98c162db4 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/BusinessConnectionTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/BusinessConnectionTriggers.kt
@@ -19,15 +19,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onBusinessConnection(
     initialFilter: SimpleFilter<BusinessConnection>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, BusinessConnection, Update>? = null,
-    markerFactory: MarkerFactory<in BusinessConnection, Any> = ByUserBusinessConnectionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in BusinessConnection, Any>? = ByUserBusinessConnectionUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, BusinessConnection>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.businessConnectionUpdateOrNull() ?.data) ?.let(::listOfNotNull)
@@ -40,15 +41,16 @@ suspend fun <BC : BehaviourContext> BC.onBusinessConnection(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onBusinessConnectionEnabled(
     initialFilter: SimpleFilter<BusinessConnection.Enabled>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, BusinessConnection.Enabled, Update>? = null,
-    markerFactory: MarkerFactory<in BusinessConnection.Enabled, Any> = ByUserBusinessConnectionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in BusinessConnection.Enabled, Any>? = ByUserBusinessConnectionUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, BusinessConnection.Enabled>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.businessConnectionUpdateOrNull() ?.data ?.enabledOrNull()) ?.let(::listOfNotNull)
@@ -60,15 +62,16 @@ suspend fun <BC : BehaviourContext> BC.onBusinessConnectionEnabled(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onBusinessConnectionDisabled(
     initialFilter: SimpleFilter<BusinessConnection.Disabled>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, BusinessConnection.Disabled, Update>? = null,
-    markerFactory: MarkerFactory<in BusinessConnection.Disabled, Any> = ByUserBusinessConnectionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in BusinessConnection.Disabled, Any>? = ByUserBusinessConnectionUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, BusinessConnection.Disabled>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.businessConnectionUpdateOrNull() ?.data ?.disabledOrNull()) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggers.kt
index c2ca912858..07d81d044e 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggers.kt
@@ -18,7 +18,7 @@ import kotlinx.coroutines.Job
 internal suspend inline fun <BC : BehaviourContext, reified T : CallbackQuery> BC.onCallbackQuery(
     initialFilter: SimpleFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in T, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in T, Any>? = ByUserCallbackQueryMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.callbackQueryUpdateOrNull() ?.data as? T) ?.let(::listOfNotNull)
@@ -31,15 +31,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : CallbackQuery> B
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 internal suspend inline fun <BC : BehaviourContext, reified T : DataCallbackQuery> BC.onDataCallbackQueryCounted(
     initialFilter: SimpleFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in T, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in T, Any>? = ByUserCallbackQueryMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>
 ): Job {
     val newInitialFilter = SimpleFilter<DataCallbackQuery> {
@@ -73,15 +74,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : DataCallbackQuer
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDataCallbackQuery(
     initialFilter: SimpleFilter<DataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in DataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in DataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DataCallbackQuery>
 ) = onDataCallbackQueryCounted(
     initialFilter,
@@ -99,8 +101,9 @@ suspend fun <BC : BehaviourContext> BC.onDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -108,7 +111,7 @@ suspend fun <BC : BehaviourContext> BC.onDataCallbackQuery(
     dataRegex: Regex,
     initialFilter: SimpleFilter<DataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in DataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in DataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DataCallbackQuery>
 ) = onDataCallbackQuery(
     initialFilter = initialFilter * {
@@ -127,8 +130,9 @@ suspend fun <BC : BehaviourContext> BC.onDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -136,7 +140,7 @@ suspend fun <BC : BehaviourContext> BC.onDataCallbackQuery(
     data: String,
     initialFilter: SimpleFilter<DataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in DataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in DataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DataCallbackQuery>
 ) = onDataCallbackQuery(
     Regex(data),
@@ -153,15 +157,16 @@ suspend fun <BC : BehaviourContext> BC.onDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGameShortNameCallbackQuery(
     initialFilter: SimpleFilter<GameShortNameCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, GameShortNameCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in GameShortNameCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in GameShortNameCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, GameShortNameCallbackQuery>
 ) = onCallbackQuery(
     initialFilter,
@@ -177,15 +182,16 @@ suspend fun <BC : BehaviourContext> BC.onGameShortNameCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onInlineMessageIdCallbackQuery(
     initialFilter: SimpleFilter<InlineMessageIdCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineMessageIdCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineMessageIdCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineMessageIdCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineMessageIdCallbackQuery>
 ) = onCallbackQuery(
     initialFilter,
@@ -201,15 +207,16 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onInlineMessageIdDataCallbackQuery(
     initialFilter: SimpleFilter<InlineMessageIdDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineMessageIdDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineMessageIdDataCallbackQuery>
 ) = onDataCallbackQueryCounted(
     initialFilter,
@@ -227,8 +234,9 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -236,7 +244,7 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdDataCallbackQuery(
     dataRegex: Regex,
     initialFilter: SimpleFilter<InlineMessageIdDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineMessageIdDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineMessageIdDataCallbackQuery>
 ) = onInlineMessageIdDataCallbackQuery(
     initialFilter = initialFilter * {
@@ -255,8 +263,9 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -264,7 +273,7 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdDataCallbackQuery(
     data: String,
     initialFilter: SimpleFilter<InlineMessageIdDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineMessageIdDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineMessageIdDataCallbackQuery>
 ) = onInlineMessageIdDataCallbackQuery(
     Regex(data),
@@ -281,15 +290,16 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onInlineMessageIdGameShortNameCallbackQuery(
     initialFilter: SimpleFilter<InlineMessageIdGameShortNameCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineMessageIdGameShortNameCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineMessageIdGameShortNameCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineMessageIdGameShortNameCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineMessageIdGameShortNameCallbackQuery>
 ) = onCallbackQuery(
     initialFilter,
@@ -305,15 +315,16 @@ suspend fun <BC : BehaviourContext> BC.onInlineMessageIdGameShortNameCallbackQue
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMessageCallbackQuery(
     initialFilter: SimpleFilter<MessageCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MessageCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in MessageCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in MessageCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MessageCallbackQuery>
 ) = onCallbackQuery(
     initialFilter,
@@ -329,15 +340,16 @@ suspend fun <BC : BehaviourContext> BC.onMessageCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMessageDataCallbackQuery(
     initialFilter: SimpleFilter<MessageDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MessageDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MessageDataCallbackQuery>
 ) = onDataCallbackQueryCounted(
     initialFilter,
@@ -355,8 +367,9 @@ suspend fun <BC : BehaviourContext> BC.onMessageDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -364,7 +377,7 @@ suspend fun <BC : BehaviourContext> BC.onMessageDataCallbackQuery(
     dataRegex: Regex,
     initialFilter: SimpleFilter<MessageDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MessageDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MessageDataCallbackQuery>
 ) = onMessageDataCallbackQuery(
     initialFilter = initialFilter * {
@@ -383,8 +396,9 @@ suspend fun <BC : BehaviourContext> BC.onMessageDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -392,7 +406,7 @@ suspend fun <BC : BehaviourContext> BC.onMessageDataCallbackQuery(
     data: String,
     initialFilter: SimpleFilter<MessageDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MessageDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MessageDataCallbackQuery>
 ) = onMessageDataCallbackQuery(
     Regex(data),
@@ -409,15 +423,16 @@ suspend fun <BC : BehaviourContext> BC.onMessageDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMessageGameShortNameCallbackQuery(
     initialFilter: SimpleFilter<MessageGameShortNameCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MessageGameShortNameCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in MessageGameShortNameCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in MessageGameShortNameCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MessageGameShortNameCallbackQuery>
 ) = onCallbackQuery(
     initialFilter,
@@ -433,15 +448,16 @@ suspend fun <BC : BehaviourContext> BC.onMessageGameShortNameCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onUnknownCallbackQueryType(
     initialFilter: SimpleFilter<UnknownCallbackQueryType>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, UnknownCallbackQueryType, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in UnknownCallbackQueryType, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in UnknownCallbackQueryType, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, UnknownCallbackQueryType>
 ) = onCallbackQuery(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggersUnhandled.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggersUnhandled.kt
index 22f4fd4bdb..01fa602bab 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggersUnhandled.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CallbackQueryTriggersUnhandled.kt
@@ -18,8 +18,9 @@ import dev.inmo.tgbotapi.utils.PreviewFeature
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -27,7 +28,7 @@ import dev.inmo.tgbotapi.utils.PreviewFeature
 suspend fun <BC : BehaviourContext> BC.onUnhandledDataCallbackQuery(
     initialFilter: SimpleFilter<DataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in DataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in DataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DataCallbackQuery>
 ) = onCallbackQuery (
     initialFilter * !SimpleFilter<MessageDataCallbackQuery> { triggersHolder.handleableCallbackQueriesDataHolder.isHandled(it) },
@@ -43,8 +44,9 @@ suspend fun <BC : BehaviourContext> BC.onUnhandledDataCallbackQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -52,7 +54,7 @@ suspend fun <BC : BehaviourContext> BC.onUnhandledDataCallbackQuery(
 suspend fun <BC : BehaviourContext> BC.onUnhandledInlineMessageIdDataCallbackQuery(
     initialFilter: SimpleFilter<InlineMessageIdDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineMessageIdDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineMessageIdDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineMessageIdDataCallbackQuery>
 ) = onCallbackQuery (
     initialFilter * !SimpleFilter<InlineMessageIdDataCallbackQuery> { triggersHolder.handleableCallbackQueriesDataHolder.isHandled(it) },
@@ -68,8 +70,9 @@ suspend fun <BC : BehaviourContext> BC.onUnhandledInlineMessageIdDataCallbackQue
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
@@ -77,7 +80,7 @@ suspend fun <BC : BehaviourContext> BC.onUnhandledInlineMessageIdDataCallbackQue
 suspend fun <BC : BehaviourContext> BC.onUnhandledMessageDataCallbackQuery(
     initialFilter: SimpleFilter<MessageDataCallbackQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MessageDataCallbackQuery, Update>? = CallbackQueryFilterByUser,
-    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any> = ByUserCallbackQueryMarkerFactory,
+    markerFactory: MarkerFactory<in MessageDataCallbackQuery, Any>? = ByUserCallbackQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MessageDataCallbackQuery>
 ) = onCallbackQuery(
     initialFilter * !SimpleFilter<MessageDataCallbackQuery> { triggersHolder.handleableCallbackQueriesDataHolder.isHandled(it) },
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostRemovedTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostRemovedTriggers.kt
index 3dae6f99ef..84514846d0 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostRemovedTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostRemovedTriggers.kt
@@ -19,15 +19,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatBoostRemoved(
     initialFilter: SimpleFilter<ChatBoostRemoved>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatBoostRemoved, Update>? = null,
-    markerFactory: MarkerFactory<ChatBoostRemoved, Any> = ByIdChatBoostRemovedMarkerFactory,
+    markerFactory: MarkerFactory<ChatBoostRemoved, Any>? = ByIdChatBoostRemovedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatBoostRemoved>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.chatBoostRemovedUpdateOrNull() ?.data) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostUpdatedTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostUpdatedTriggers.kt
index 5e94dab7ce..1dc75a2d41 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostUpdatedTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatBoostUpdatedTriggers.kt
@@ -19,15 +19,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatBoostUpdated(
     initialFilter: SimpleFilter<ChatBoostUpdated>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatBoostUpdated, Update>? = null,
-    markerFactory: MarkerFactory<ChatBoostUpdated, Any> = ByIdChatBoostUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<ChatBoostUpdated, Any>? = ByIdChatBoostUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatBoostUpdated>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.chatBoostUpdatedUpdateOrNull() ?.data) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatJoinRequestTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatJoinRequestTriggers.kt
index 21cbd37159..067c35fa3e 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatJoinRequestTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatJoinRequestTriggers.kt
@@ -17,15 +17,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatJoinRequest(
     initialFilter: SimpleFilter<ChatJoinRequest>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatJoinRequest, Update>? = null,
-    markerFactory: MarkerFactory<in ChatJoinRequest, Any> = ByChatChatJoinRequestMarkerFactory,
+    markerFactory: MarkerFactory<in ChatJoinRequest, Any>? = ByChatChatJoinRequestMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatJoinRequest>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.chatJoinRequestUpdateOrNull() ?.data) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMemberUpdatedTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMemberUpdatedTriggers.kt
index bdfec02d1a..e963b4651c 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMemberUpdatedTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMemberUpdatedTriggers.kt
@@ -17,7 +17,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified U : ChatMemberUpdatedUpdate> BC.onChatMemberUpdatedInternal(
     initialFilter: SimpleFilter<ChatMemberUpdated>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMemberUpdated, Update>? = ChatMemberUpdatedFilterByChat,
-    markerFactory: MarkerFactory<ChatMemberUpdated, Any> = ByChatChatMemberUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<ChatMemberUpdated, Any>? = ByChatChatMemberUpdatedMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMemberUpdated>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     ((it as? U) ?.data) ?.let(::listOfNotNull)
@@ -31,15 +31,16 @@ internal suspend inline fun <BC : BehaviourContext, reified U : ChatMemberUpdate
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatMemberUpdated(
     initialFilter: SimpleFilter<ChatMemberUpdated>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMemberUpdated, Update>? = ChatMemberUpdatedFilterByChat,
-    markerFactory: MarkerFactory<ChatMemberUpdated, Any> = ByChatChatMemberUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<ChatMemberUpdated, Any>? = ByChatChatMemberUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMemberUpdated>
 ) = onChatMemberUpdatedInternal<BC, ChatMemberUpdatedUpdate>(
     initialFilter,
@@ -55,15 +56,16 @@ suspend fun <BC : BehaviourContext> BC.onChatMemberUpdated(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onCommonChatMemberUpdated(
     initialFilter: SimpleFilter<ChatMemberUpdated>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMemberUpdated, Update>? = ChatMemberUpdatedFilterByChat,
-    markerFactory: MarkerFactory<ChatMemberUpdated, Any> = ByChatChatMemberUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<ChatMemberUpdated, Any>? = ByChatChatMemberUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMemberUpdated>
 ) = onChatMemberUpdatedInternal<BC, CommonChatMemberUpdatedUpdate>(
     initialFilter,
@@ -79,15 +81,16 @@ suspend fun <BC : BehaviourContext> BC.onCommonChatMemberUpdated(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMyChatMemberUpdated(
     initialFilter: SimpleFilter<ChatMemberUpdated>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMemberUpdated, Update>? = ChatMemberUpdatedFilterByChat,
-    markerFactory: MarkerFactory<ChatMemberUpdated, Any> = ByChatChatMemberUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<ChatMemberUpdated, Any>? = ByChatChatMemberUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMemberUpdated>
 ) = onChatMemberUpdatedInternal<BC, MyChatMemberUpdatedUpdate>(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionCountUpdatedUpdatesTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionCountUpdatedUpdatesTriggers.kt
index 9db5e94a07..8a172e0906 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionCountUpdatedUpdatesTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionCountUpdatedUpdatesTriggers.kt
@@ -23,15 +23,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatMessageReactionsCountUpdated(
     initialFilter: SimpleFilter<ChatMessageReactionsCountUpdated>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMessageReactionsCountUpdated, Update>? = null,
-    markerFactory: MarkerFactory<ChatMessageReactionsCountUpdated, Any> = ByChatIdChatMessageReactionsCountUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<ChatMessageReactionsCountUpdated, Any>? = ByChatIdChatMessageReactionsCountUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMessageReactionsCountUpdated>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.chatMessageReactionsCountUpdatedUpdateOrNull() ?.data) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionUpdatedUpdatesTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionUpdatedUpdatesTriggers.kt
index fcad229211..d822f6bb9d 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionUpdatedUpdatesTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChatMessageReactionUpdatedUpdatesTriggers.kt
@@ -15,7 +15,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : ChatMessageReactionUpdated> BC.onChatMessageReactionUpdated(
     initialFilter: SimpleFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = null,
-    markerFactory: MarkerFactory<in T, Any> = ByChatIdChatMessageReactionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in T, Any>? = ByChatIdChatMessageReactionUpdatedMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.chatMessageReactionUpdatedUpdateOrNull() ?.data as? T) ?.let(::listOfNotNull)
@@ -28,15 +28,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : ChatMessageReact
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatMessageReactionUpdatedByUser(
     initialFilter: SimpleFilter<ChatMessageReactionUpdated.ByUser>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMessageReactionUpdated.ByUser, Update>? = null,
-    markerFactory: MarkerFactory<in ChatMessageReactionUpdated.ByUser, Any> = ByChatIdChatMessageReactionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in ChatMessageReactionUpdated.ByUser, Any>? = ByChatIdChatMessageReactionUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMessageReactionUpdated.ByUser>
 ) = onChatMessageReactionUpdated(
     initialFilter,
@@ -52,15 +53,16 @@ suspend fun <BC : BehaviourContext> BC.onChatMessageReactionUpdatedByUser(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatMessageReactionUpdatedByChat(
     initialFilter: SimpleFilter<ChatMessageReactionUpdated.ByChat>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMessageReactionUpdated.ByChat, Update>? = null,
-    markerFactory: MarkerFactory<in ChatMessageReactionUpdated.ByChat, Any> = ByChatIdChatMessageReactionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in ChatMessageReactionUpdated.ByChat, Any>? = ByChatIdChatMessageReactionUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMessageReactionUpdated.ByChat>
 ) = onChatMessageReactionUpdated(
     initialFilter,
@@ -76,15 +78,16 @@ suspend fun <BC : BehaviourContext> BC.onChatMessageReactionUpdatedByChat(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatMessageReactionUpdatedUnknown(
     initialFilter: SimpleFilter<ChatMessageReactionUpdated.Unknown>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatMessageReactionUpdated.Unknown, Update>? = null,
-    markerFactory: MarkerFactory<in ChatMessageReactionUpdated.Unknown, Any> = ByChatIdChatMessageReactionUpdatedMarkerFactory,
+    markerFactory: MarkerFactory<in ChatMessageReactionUpdated.Unknown, Any>? = ByChatIdChatMessageReactionUpdatedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatMessageReactionUpdated.Unknown>
 ) = onChatMessageReactionUpdated(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChosenInlineResultTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChosenInlineResultTriggers.kt
index b4f7a00dfa..0d3b24dec6 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChosenInlineResultTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ChosenInlineResultTriggers.kt
@@ -13,7 +13,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : ChosenInlineResult> BC.onChosenInlineResultBase(
     initialFilter: SimpleFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = null,
-    markerFactory: MarkerFactory<in T, Any> = ByUserIdChosenInlineResultMarkerFactory,
+    markerFactory: MarkerFactory<in T, Any>? = ByUserIdChosenInlineResultMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.chosenInlineResultUpdateOrNull() ?.data as? T) ?.let(::listOfNotNull)
@@ -26,15 +26,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : ChosenInlineResu
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChosenInlineResult(
     initialFilter: SimpleFilter<ChosenInlineResult>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChosenInlineResult, Update>? = null,
-    markerFactory: MarkerFactory<in ChosenInlineResult, Any> = ByUserIdChosenInlineResultMarkerFactory,
+    markerFactory: MarkerFactory<in ChosenInlineResult, Any>? = ByUserIdChosenInlineResultMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChosenInlineResult>
 ) = onChosenInlineResultBase(
     initialFilter,
@@ -50,15 +51,16 @@ suspend fun <BC : BehaviourContext> BC.onChosenInlineResult(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onLocationChosenInlineResult(
     initialFilter: SimpleFilter<LocationChosenInlineResult>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, LocationChosenInlineResult, Update>? = null,
-    markerFactory: MarkerFactory<in LocationChosenInlineResult, Any> = ByUserIdChosenInlineResultMarkerFactory,
+    markerFactory: MarkerFactory<in LocationChosenInlineResult, Any>? = ByUserIdChosenInlineResultMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, LocationChosenInlineResult>
 ) = onChosenInlineResultBase(
     initialFilter,
@@ -74,15 +76,16 @@ suspend fun <BC : BehaviourContext> BC.onLocationChosenInlineResult(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onBaseChosenInlineResult(
     initialFilter: SimpleFilter<BaseChosenInlineResult>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, BaseChosenInlineResult, Update>? = null,
-    markerFactory: MarkerFactory<in BaseChosenInlineResult, Any> = ByUserIdChosenInlineResultMarkerFactory,
+    markerFactory: MarkerFactory<in BaseChosenInlineResult, Any>? = ByUserIdChosenInlineResultMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, BaseChosenInlineResult>
 ) = onChosenInlineResultBase(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandling.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandling.kt
index bad353d964..b791581b99 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandling.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandling.kt
@@ -25,7 +25,7 @@ internal suspend fun <BC : BehaviourContext> BC.commandUncounted(
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = onText(
     CommonMessageFilter<TextContent> { message ->
@@ -52,7 +52,7 @@ suspend fun <BC : BehaviourContext> BC.command(
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = runCatchingSafely {
     commandUncounted(
@@ -76,56 +76,86 @@ suspend fun <BC : BehaviourContext> BC.command(
     }
 }.getOrThrow()
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.command(
     command: String,
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ) = command(command.toRegex(), requireOnlyCommandInMessage, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.command(
     botCommand: BotCommand,
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ) = command(botCommand.command, requireOnlyCommandInMessage, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommand(
     commandRegex: Regex,
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = command(commandRegex, requireOnlyCommandInMessage, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommand(
     command: String,
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = onCommand(command.toRegex(), requireOnlyCommandInMessage, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommand(
     botCommand: BotCommand,
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = onCommand(botCommand.command, requireOnlyCommandInMessage, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.commandWithArgs(
     commandRegex: Regex,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Array<String>>
 ) = command(
@@ -142,11 +172,16 @@ suspend fun <BC : BehaviourContext> BC.commandWithArgs(
     scenarioReceiver(it, args)
 }
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.commandWithArgs(
     command: String,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Array<String>>
 ) = commandWithArgs(
@@ -158,11 +193,16 @@ suspend fun <BC : BehaviourContext> BC.commandWithArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.commandWithArgs(
     botCommand: BotCommand,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Array<String>>
 ) = commandWithArgs(
@@ -174,11 +214,16 @@ suspend fun <BC : BehaviourContext> BC.commandWithArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.commandWithNamedArgs(
     commandRegex: Regex,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     nameArgSeparator: Regex = TelegramBotCommandsDefaults.defaultNamesArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, List<Pair<String, String>>>
@@ -196,11 +241,16 @@ suspend fun <BC : BehaviourContext> BC.commandWithNamedArgs(
     scenarioReceiver(it, args)
 }
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.commandWithNamedArgs(
     command: String,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     nameArgSeparator: Regex = TelegramBotCommandsDefaults.defaultNamesArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, List<Pair<String, String>>>
@@ -214,11 +264,16 @@ suspend fun <BC : BehaviourContext> BC.commandWithNamedArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.commandWithNamedArgs(
     botCommand: BotCommand,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     nameArgSeparator: Regex = TelegramBotCommandsDefaults.defaultNamesArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, List<Pair<String, String>>>
@@ -232,11 +287,16 @@ suspend fun <BC : BehaviourContext> BC.commandWithNamedArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommandWithArgs(
     commandRegex: Regex,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Array<String>>
 ): Job = commandWithArgs(
@@ -248,11 +308,16 @@ suspend fun <BC : BehaviourContext> BC.onCommandWithArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommandWithArgs(
     command: String,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Array<String>>
 ): Job = onCommandWithArgs(
@@ -264,11 +329,16 @@ suspend fun <BC : BehaviourContext> BC.onCommandWithArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommandWithArgs(
     botCommand: BotCommand,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Array<String>>
 ): Job = onCommandWithArgs(
@@ -280,11 +350,16 @@ suspend fun <BC : BehaviourContext> BC.onCommandWithArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommandWithNamedArgs(
     commandRegex: Regex,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     nameArgSeparator: Regex = TelegramBotCommandsDefaults.defaultNamesArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, List<Pair<String, String>>>
@@ -298,11 +373,16 @@ suspend fun <BC : BehaviourContext> BC.onCommandWithNamedArgs(
     scenarioReceiver = scenarioReceiver,
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommandWithNamedArgs(
     command: String,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     nameArgSeparator: Regex = TelegramBotCommandsDefaults.defaultNamesArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, List<Pair<String, String>>>
@@ -316,11 +396,16 @@ suspend fun <BC : BehaviourContext> BC.onCommandWithNamedArgs(
     scenarioReceiver = scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onCommandWithNamedArgs(
     botCommand: BotCommand,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     argsSeparator: Regex = TelegramBotCommandsDefaults.defaultArgsSeparatorRegex,
     nameArgSeparator: Regex = TelegramBotCommandsDefaults.defaultNamesArgsSeparatorRegex,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, List<Pair<String, String>>>
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandlingUnhandled.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandlingUnhandled.kt
index de00275251..8eb4a0805d 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandlingUnhandled.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/CommandHandlingUnhandled.kt
@@ -16,12 +16,17 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 import dev.inmo.tgbotapi.utils.PreviewFeature
 import kotlinx.coroutines.Job
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 @PreviewFeature
 suspend fun <BC : BehaviourContext> BC.unhandledCommand(
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = onText(
     CommonMessageFilter<TextContent> { message ->
@@ -44,20 +49,30 @@ suspend fun <BC : BehaviourContext> BC.unhandledCommand(
     scenarioReceiver
 )
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 @PreviewFeature
 suspend fun <BC : BehaviourContext> BC.onUnhandledCommand(
     requireOnlyCommandInMessage: Boolean = true,
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ): Job = unhandledCommand(requireOnlyCommandInMessage, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 @PreviewFeature
 suspend fun <BC : BehaviourContext> BC.unhandledCommandWithArgs(
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Map<String, Array<String>>>
 ) = onUnhandledCommand(
     requireOnlyCommandInMessage = false,
@@ -71,10 +86,15 @@ suspend fun <BC : BehaviourContext> BC.unhandledCommandWithArgs(
     scenarioReceiver(it, args)
 }
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 @PreviewFeature
 suspend fun <BC : BehaviourContext> BC.onUnhandledCommandWithArgs(
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTwoTypesReceiver<BC, Unit, TextMessage, Map<String, Array<String>>>
 ): Job = unhandledCommandWithArgs(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ContentTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ContentTriggers.kt
index 5d66a1ed66..32a0d90bb6 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ContentTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ContentTriggers.kt
@@ -9,6 +9,7 @@ import dev.inmo.tgbotapi.extensions.behaviour_builder.utils.SimpleFilter
 import dev.inmo.tgbotapi.extensions.behaviour_builder.utils.marker_factories.ByChatMessageMarkerFactory
 import dev.inmo.tgbotapi.extensions.behaviour_builder.utils.marker_factories.MarkerFactory
 import dev.inmo.tgbotapi.extensions.utils.whenCommonMessage
+import dev.inmo.tgbotapi.extensions.utils.withContentOrNull
 import dev.inmo.tgbotapi.types.files.TelegramMediaFile
 import dev.inmo.tgbotapi.types.message.abstracts.CommonMessage
 import dev.inmo.tgbotapi.types.message.content.*
@@ -20,14 +21,14 @@ typealias CommonMessageFilter<T> = SimpleFilter<CommonMessage<T>>
 internal suspend inline fun <BC : BehaviourContext, reified T : MessageContent> BC.onContentMessageWithType(
     initialFilter: CommonMessageFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<T>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in CommonMessage<T>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in CommonMessage<T>, Any>? = ByChatMessageMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<T>>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     when (it) {
         is BaseSentMessageUpdate -> it.data.whenCommonMessage(::listOfNotNull)
         else -> null
     } ?.mapNotNull { message ->
-        if (message.content is T) message as CommonMessage<T> else null
+        message.withContentOrNull<T>()
     }
 }
 
@@ -39,15 +40,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : MessageContent>
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onContentMessage(
     initialFilter: CommonMessageFilter<MessageContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MessageContent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in CommonMessage<MessageContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in CommonMessage<MessageContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MessageContent>>
 ) = onContentMessageWithType(
     initialFilter,
@@ -63,15 +65,16 @@ suspend fun <BC : BehaviourContext> BC.onContentMessage(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onContact(
     initialFilter: CommonMessageFilter<ContactContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ContactMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ContactMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ContactMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ContactMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -87,15 +90,16 @@ suspend fun <BC : BehaviourContext> BC.onContact(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDice(
     initialFilter: CommonMessageFilter<DiceContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DiceMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in DiceMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in DiceMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DiceMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -111,15 +115,16 @@ suspend fun <BC : BehaviourContext> BC.onDice(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGame(
     initialFilter: CommonMessageFilter<GameContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, GameMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in GameMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in GameMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, GameMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -135,15 +140,16 @@ suspend fun <BC : BehaviourContext> BC.onGame(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onLocation(
     initialFilter: CommonMessageFilter<LocationContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, LocationMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in LocationMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in LocationMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, LocationMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -159,15 +165,16 @@ suspend fun <BC : BehaviourContext> BC.onLocation(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onLiveLocation(
     initialFilter: CommonMessageFilter<LiveLocationContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, LiveLocationMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in LiveLocationMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in LiveLocationMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, LiveLocationMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -183,15 +190,16 @@ suspend fun <BC : BehaviourContext> BC.onLiveLocation(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onStaticLocation(
     initialFilter: CommonMessageFilter<StaticLocationContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, StaticLocationMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in StaticLocationMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in StaticLocationMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, StaticLocationMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -207,15 +215,16 @@ suspend fun <BC : BehaviourContext> BC.onStaticLocation(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPoll(
     initialFilter: CommonMessageFilter<PollContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PollMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in PollMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in PollMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PollMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -231,15 +240,16 @@ suspend fun <BC : BehaviourContext> BC.onPoll(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onText(
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -255,15 +265,16 @@ suspend fun <BC : BehaviourContext> BC.onText(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onStory(
     initialFilter: CommonMessageFilter<StoryContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, StoryMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in StoryMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in StoryMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, StoryMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -279,15 +290,16 @@ suspend fun <BC : BehaviourContext> BC.onStory(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onTextedContent(
     initialFilter: CommonMessageFilter<TextedContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextedMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextedMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextedMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextedMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -303,15 +315,16 @@ suspend fun <BC : BehaviourContext> BC.onTextedContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVenue(
     initialFilter: CommonMessageFilter<VenueContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VenueMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VenueMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VenueMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VenueMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -327,15 +340,16 @@ suspend fun <BC : BehaviourContext> BC.onVenue(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onAudioMediaGroup(
     initialFilter: CommonMessageFilter<AudioMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, AudioMediaGroupMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in AudioMediaGroupMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in AudioMediaGroupMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, AudioMediaGroupMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -351,15 +365,16 @@ suspend fun <BC : BehaviourContext> BC.onAudioMediaGroup(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDocumentMediaGroupContent(
     initialFilter: CommonMessageFilter<DocumentMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DocumentMediaGroupMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in DocumentMediaGroupMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in DocumentMediaGroupMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DocumentMediaGroupMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -375,15 +390,16 @@ suspend fun <BC : BehaviourContext> BC.onDocumentMediaGroupContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onTextedMediaContent(
     initialFilter: CommonMessageFilter<TextedMediaContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextedMediaMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextedMediaMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextedMediaMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextedMediaMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -399,15 +415,16 @@ suspend fun <BC : BehaviourContext> BC.onTextedMediaContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMediaCollection(
     initialFilter: CommonMessageFilter<MediaCollectionContent<TelegramMediaFile>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaCollectionMessage<TelegramMediaFile>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in MediaCollectionMessage<TelegramMediaFile>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaCollectionMessage<TelegramMediaFile>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaCollectionMessage<TelegramMediaFile>>
 ) = onContentMessageWithType(
     initialFilter,
@@ -423,15 +440,16 @@ suspend fun <BC : BehaviourContext> BC.onMediaCollection(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMedia(
     initialFilter: CommonMessageFilter<MediaContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in MediaMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -447,15 +465,16 @@ suspend fun <BC : BehaviourContext> BC.onMedia(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onAnimation(
     initialFilter: CommonMessageFilter<AnimationContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, AnimationMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in AnimationMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in AnimationMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, AnimationMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -471,15 +490,16 @@ suspend fun <BC : BehaviourContext> BC.onAnimation(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onAudio(
     initialFilter: CommonMessageFilter<AudioContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, AudioMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in AudioMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in AudioMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, AudioMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -495,15 +515,16 @@ suspend fun <BC : BehaviourContext> BC.onAudio(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDocument(
     initialFilter: CommonMessageFilter<DocumentContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DocumentMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in DocumentMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in DocumentMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DocumentMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -519,15 +540,16 @@ suspend fun <BC : BehaviourContext> BC.onDocument(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPhoto(
     initialFilter: CommonMessageFilter<PhotoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PhotoMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in PhotoMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in PhotoMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PhotoMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -543,15 +565,16 @@ suspend fun <BC : BehaviourContext> BC.onPhoto(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onSticker(
     initialFilter: CommonMessageFilter<StickerContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, StickerMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in StickerMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in StickerMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, StickerMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -567,15 +590,16 @@ suspend fun <BC : BehaviourContext> BC.onSticker(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideo(
     initialFilter: CommonMessageFilter<VideoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VideoMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VideoMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VideoMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VideoMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -591,15 +615,16 @@ suspend fun <BC : BehaviourContext> BC.onVideo(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoNote(
     initialFilter: CommonMessageFilter<VideoNoteContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VideoNoteMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VideoNoteMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VideoNoteMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VideoNoteMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -615,15 +640,16 @@ suspend fun <BC : BehaviourContext> BC.onVideoNote(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVoice(
     initialFilter: CommonMessageFilter<VoiceContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VoiceMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VoiceMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VoiceMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VoiceMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -639,15 +665,16 @@ suspend fun <BC : BehaviourContext> BC.onVoice(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onInvoice(
     initialFilter: CommonMessageFilter<InvoiceContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InvoiceMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in InvoiceMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in InvoiceMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InvoiceMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -663,15 +690,16 @@ suspend fun <BC : BehaviourContext> BC.onInvoice(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVisualContent(
     initialFilter: CommonMessageFilter<VisualMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VisualMediaGroupMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VisualMediaGroupMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VisualMediaGroupMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VisualMediaGroupMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -687,15 +715,16 @@ suspend fun <BC : BehaviourContext> BC.onVisualContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMediaContent(
     initialFilter: CommonMessageFilter<MediaContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in MediaMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -711,15 +740,16 @@ suspend fun <BC : BehaviourContext> BC.onMediaContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGiveawayContent(
     initialFilter: CommonMessageFilter<GiveawayContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ScheduledGiveawayContentMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ScheduledGiveawayContentMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ScheduledGiveawayContentMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ScheduledGiveawayContentMessage>
 ) = onContentMessageWithType(
     initialFilter,
@@ -736,15 +766,16 @@ suspend fun <BC : BehaviourContext> BC.onGiveawayContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGiveawayPublicResultsContent(
     initialFilter: CommonMessageFilter<GiveawayPublicResultsContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, GiveawayPublicResultsContentMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in GiveawayPublicResultsContentMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in GiveawayPublicResultsContentMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, GiveawayPublicResultsContentMessage>
 ) = onContentMessageWithType(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeepLinkHandling.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeepLinkHandling.kt
index 91b1f03872..4862909143 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeepLinkHandling.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeepLinkHandling.kt
@@ -21,7 +21,7 @@ private val startRegex = Regex("start")
 suspend fun <BC : BehaviourContext> BC.onDeepLink(
     initialFilter: SimpleFilter<Pair<TextMessage, String>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, Pair<TextMessage, String>, Update>? = { (message, _), update -> MessageFilterByChat(this, message, update) },
-    markerFactory: MarkerFactory<Pair<TextMessage, String>, Any> = MarkerFactory { (message, _) -> ByChatMessageMarkerFactory(message) },
+    markerFactory: MarkerFactory<Pair<TextMessage, String>, Any>? = MarkerFactory { (message, _) -> ByChatMessageMarkerFactory(message) },
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, Pair<TextMessage, String>>
 ): Job = on(
     markerFactory,
@@ -43,11 +43,16 @@ suspend fun <BC : BehaviourContext> BC.onDeepLink(
     }
 }
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onDeepLink(
     regex: Regex,
     initialFilter: SimpleFilter<Pair<TextMessage, String>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, Pair<TextMessage, String>, Update>? = { (message, _), update -> MessageFilterByChat(this, message, update) },
-    markerFactory: MarkerFactory<Pair<TextMessage, String>, Any> = MarkerFactory { (message, _) -> ByChatMessageMarkerFactory(message) },
+    markerFactory: MarkerFactory<Pair<TextMessage, String>, Any>? = MarkerFactory { (message, _) -> ByChatMessageMarkerFactory(message) },
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, Pair<TextMessage, String>>
 ): Job {
     val internalFilter = SimpleFilter<Pair<TextMessage, String>> {
@@ -56,10 +61,15 @@ suspend fun <BC : BehaviourContext> BC.onDeepLink(
     return onDeepLink(initialFilter ?.let { internalFilter * it } ?: internalFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 }
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onDeepLink(
     deepLink: String,
     initialFilter: SimpleFilter<Pair<TextMessage, String>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, Pair<TextMessage, String>, Update>? = { (message, _), update -> MessageFilterByChat(this, message, update) },
-    markerFactory: MarkerFactory<Pair<TextMessage, String>, Any> = MarkerFactory { (message, _) -> ByChatMessageMarkerFactory(message) },
+    markerFactory: MarkerFactory<Pair<TextMessage, String>, Any>? = MarkerFactory { (message, _) -> ByChatMessageMarkerFactory(message) },
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, Pair<TextMessage, String>>
 ): Job = onDeepLink(Regex("^$deepLink$"), initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeletedBusinessMessagesTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeletedBusinessMessagesTriggers.kt
index 3e5b2be96a..b8e8da2127 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeletedBusinessMessagesTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/DeletedBusinessMessagesTriggers.kt
@@ -22,15 +22,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onBusinessMessagesDeleted(
     initialFilter: SimpleFilter<BusinessMessagesDeleted>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, BusinessMessagesDeleted, Update>? = null,
-    markerFactory: MarkerFactory<in BusinessMessagesDeleted, Any> = ByBusinessConnectionIdBusinessMessagesDeletedMarkerFactory,
+    markerFactory: MarkerFactory<in BusinessMessagesDeleted, Any>? = ByBusinessConnectionIdBusinessMessagesDeletedMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, BusinessMessagesDeleted>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.deletedBusinessMessageUpdateOrNull() ?.data) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EditedContentTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EditedContentTriggers.kt
index 1978e5540f..9d8b508b7f 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EditedContentTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EditedContentTriggers.kt
@@ -17,7 +17,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : MessageContent> BC.onEditedContent(
     initialFilter: CommonMessageFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<T>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in CommonMessage<T>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in CommonMessage<T>, Any>? = ByChatMessageMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<T>>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     it.baseEditMessageUpdateOrNull() ?.data ?.withContent<T>() ?.let(::listOfNotNull)
@@ -31,15 +31,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : MessageContent>
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedContentMessage(
     initialFilter: CommonMessageFilter<MessageContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MessageContent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in CommonMessage<MessageContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in CommonMessage<MessageContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MessageContent>>
 )= onEditedContent(
     initialFilter,
@@ -55,15 +56,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedContentMessage(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedContact(
     initialFilter: CommonMessageFilter<ContactContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ContactMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ContactMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ContactMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ContactMessage>
 )= onEditedContent(
     initialFilter,
@@ -79,15 +81,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedContact(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedDice(
     initialFilter: CommonMessageFilter<DiceContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DiceMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in DiceMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in DiceMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DiceMessage>
 )= onEditedContent(
     initialFilter,
@@ -103,15 +106,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedDice(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedGame(
     initialFilter: CommonMessageFilter<GameContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, GameMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in GameMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in GameMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, GameMessage>
 )= onEditedContent(
     initialFilter,
@@ -127,15 +131,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedGame(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedLocation(
     initialFilter: CommonMessageFilter<LocationContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, LocationMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in LocationMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in LocationMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, LocationMessage>
 )= onEditedContent(
     initialFilter,
@@ -151,15 +156,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedLocation(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedText(
     initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>
 )= onEditedContent(
     initialFilter,
@@ -175,15 +181,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedText(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedVenue(
     initialFilter: CommonMessageFilter<VenueContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VenueMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VenueMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VenueMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VenueMessage>
 )= onEditedContent(
     initialFilter,
@@ -199,15 +206,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedVenue(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedAudioMediaGroup(
     initialFilter: CommonMessageFilter<AudioMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, AudioMediaGroupMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in AudioMediaGroupMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in AudioMediaGroupMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, AudioMediaGroupMessage>
 )= onEditedContent(
     initialFilter,
@@ -223,15 +231,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedAudioMediaGroup(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedDocumentMediaGroupContent(
     initialFilter: CommonMessageFilter<DocumentMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DocumentMediaGroupMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in DocumentMediaGroupMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in DocumentMediaGroupMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DocumentMediaGroupMessage>
 )= onEditedContent(
     initialFilter,
@@ -247,15 +256,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedDocumentMediaGroupContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedTextedMediaContent(
     initialFilter: CommonMessageFilter<TextedMediaContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextedMediaMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in TextedMediaMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in TextedMediaMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextedMediaMessage>
 )= onEditedContent(
     initialFilter,
@@ -271,15 +281,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedTextedMediaContent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedMediaCollection(
     initialFilter: CommonMessageFilter<MediaCollectionContent<TelegramMediaFile>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaCollectionMessage<TelegramMediaFile>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in MediaCollectionMessage<TelegramMediaFile>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaCollectionMessage<TelegramMediaFile>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaCollectionMessage<TelegramMediaFile>>
 )= onEditedContent(
     initialFilter,
@@ -295,15 +306,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedMediaCollection(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedMedia(
     initialFilter: CommonMessageFilter<MediaContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in MediaMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaMessage>
 )= onEditedContent(
     initialFilter,
@@ -319,15 +331,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedMedia(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedAnimation(
     initialFilter: CommonMessageFilter<AnimationContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, AnimationMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in AnimationMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in AnimationMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, AnimationMessage>
 )= onEditedContent(
     initialFilter,
@@ -343,15 +356,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedAnimation(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedAudio(
     initialFilter: CommonMessageFilter<AudioContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, AudioMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in AudioMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in AudioMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, AudioMessage>
 )= onEditedContent(
     initialFilter,
@@ -367,15 +381,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedAudio(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedDocument(
     initialFilter: CommonMessageFilter<DocumentContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, DocumentMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in DocumentMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in DocumentMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, DocumentMessage>
 )= onEditedContent(
     initialFilter,
@@ -391,15 +406,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedDocument(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedPhoto(
     initialFilter: CommonMessageFilter<PhotoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PhotoMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in PhotoMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in PhotoMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PhotoMessage>
 )= onEditedContent(
     initialFilter,
@@ -415,15 +431,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedPhoto(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedSticker(
     initialFilter: CommonMessageFilter<StickerContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, StickerMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in StickerMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in StickerMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, StickerMessage>
 )= onEditedContent(
     initialFilter,
@@ -439,15 +456,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedSticker(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedVideo(
     initialFilter: CommonMessageFilter<VideoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VideoMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VideoMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VideoMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VideoMessage>
 )= onEditedContent(
     initialFilter,
@@ -463,15 +481,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedVideo(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedVideoNote(
     initialFilter: CommonMessageFilter<VideoNoteContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VideoNoteMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VideoNoteMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VideoNoteMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VideoNoteMessage>
 )= onEditedContent(
     initialFilter,
@@ -487,15 +506,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedVideoNote(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedVoice(
     initialFilter: CommonMessageFilter<VoiceContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, VoiceMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in VoiceMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in VoiceMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, VoiceMessage>
 )= onEditedContent(
     initialFilter,
@@ -511,15 +531,16 @@ suspend fun <BC : BehaviourContext> BC.onEditedVoice(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onEditedInvoice(
     initialFilter: CommonMessageFilter<InvoiceContent>? = CommonMessageFilterExcludeMediaGroups,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InvoiceMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in InvoiceMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in InvoiceMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InvoiceMessage>
 )= onEditedContent(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EventTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EventTriggers.kt
index eb60a8b17f..8ff4fc5aaa 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EventTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/EventTriggers.kt
@@ -33,7 +33,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : ChatEvent> BC.onEvent(
     initialFilter: SimpleFilter<ChatEventMessage<T>>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<T>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<T>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<T>, Any>? = ByChatMessageMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<T>>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     @Suppress("UNCHECKED_CAST")
@@ -43,7 +43,7 @@ internal suspend inline fun <BC : BehaviourContext, reified T : ChatEvent> BC.on
 internal suspend inline fun <BC : BehaviourContext, reified T : ChatEvent, reified CEM : ChatEventMessage<T>> BC.onEventWithCustomChatEventMessage(
     initialFilter: SimpleFilter<CEM>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CEM, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in CEM, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in CEM, Any>? = ByChatMessageMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CEM>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     @Suppress("UNCHECKED_CAST")
@@ -57,15 +57,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : ChatEvent, reifi
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChannelEvent(
     initialFilter: SimpleFilter<ChatEventMessage<ChannelEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<ChannelEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChannelEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChannelEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<ChannelEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -76,15 +77,16 @@ suspend fun <BC : BehaviourContext> BC.onChannelEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPrivateEvent(
     initialFilter: SimpleFilter<ChatEventMessage<PrivateEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<PrivateEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<PrivateEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<PrivateEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<PrivateEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -95,15 +97,16 @@ suspend fun <BC : BehaviourContext> BC.onPrivateEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatEvent(
     initialFilter: SimpleFilter<ChatEventMessage<ChatEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<ChatEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChatEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChatEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<ChatEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -114,15 +117,16 @@ suspend fun <BC : BehaviourContext> BC.onChatEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoChatEvent(
     initialFilter: SimpleFilter<ChatEventMessage<VideoChatEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<VideoChatEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<VideoChatEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -133,15 +137,16 @@ suspend fun <BC : BehaviourContext> BC.onVideoChatEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoChatStartedEvent(
     initialFilter: SimpleFilter<ChatEventMessage<VideoChatStarted>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<VideoChatStarted>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatStarted>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatStarted>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<VideoChatStarted>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -152,15 +157,16 @@ suspend fun <BC : BehaviourContext> BC.onVideoChatStartedEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoChatEndedEvent(
     initialFilter: SimpleFilter<ChatEventMessage<VideoChatEnded>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<VideoChatEnded>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatEnded>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatEnded>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<VideoChatEnded>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -171,15 +177,16 @@ suspend fun <BC : BehaviourContext> BC.onVideoChatEndedEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoChatParticipantsInvitedEvent(
     initialFilter: SimpleFilter<ChatEventMessage<VideoChatParticipantsInvited>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<VideoChatParticipantsInvited>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatParticipantsInvited>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<VideoChatParticipantsInvited>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<VideoChatParticipantsInvited>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -190,15 +197,16 @@ suspend fun <BC : BehaviourContext> BC.onVideoChatParticipantsInvitedEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMessageAutoDeleteTimerChangedEvent(
     initialFilter: SimpleFilter<ChatEventMessage<MessageAutoDeleteTimerChanged>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<MessageAutoDeleteTimerChanged>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<MessageAutoDeleteTimerChanged>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<MessageAutoDeleteTimerChanged>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<MessageAutoDeleteTimerChanged>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -209,15 +217,16 @@ suspend fun <BC : BehaviourContext> BC.onMessageAutoDeleteTimerChangedEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPublicChatEvent(
     initialFilter: SimpleFilter<ChatEventMessage<PublicChatEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<PublicChatEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<PublicChatEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<PublicChatEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<PublicChatEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -228,15 +237,16 @@ suspend fun <BC : BehaviourContext> BC.onPublicChatEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onCommonEvent(
     initialFilter: SimpleFilter<ChatEventMessage<CommonEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<CommonEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<CommonEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<CommonEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<CommonEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -247,15 +257,16 @@ suspend fun <BC : BehaviourContext> BC.onCommonEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGroupEvent(
     initialFilter: SimpleFilter<ChatEventMessage<GroupEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<GroupEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<GroupEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<GroupEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<GroupEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -266,15 +277,16 @@ suspend fun <BC : BehaviourContext> BC.onGroupEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onSupergroupEvent(
     initialFilter: SimpleFilter<ChatEventMessage<SupergroupEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<SupergroupEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<SupergroupEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<SupergroupEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<SupergroupEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -285,15 +297,16 @@ suspend fun <BC : BehaviourContext> BC.onSupergroupEvent(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChannelChatCreated(
     initialFilter: SimpleFilter<ChatEventMessage<ChannelChatCreated>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<ChannelChatCreated>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChannelChatCreated>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChannelChatCreated>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<ChannelChatCreated>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -304,15 +317,16 @@ suspend fun <BC : BehaviourContext> BC.onChannelChatCreated(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDeleteChatPhoto(
     initialFilter: SimpleFilter<ChatEventMessage<DeleteChatPhoto>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<DeleteChatPhoto>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<DeleteChatPhoto>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<DeleteChatPhoto>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<DeleteChatPhoto>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -323,15 +337,16 @@ suspend fun <BC : BehaviourContext> BC.onDeleteChatPhoto(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGroupChatCreated(
     initialFilter: SimpleFilter<ChatEventMessage<GroupChatCreated>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<GroupChatCreated>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<GroupChatCreated>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<GroupChatCreated>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<GroupChatCreated>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -342,15 +357,16 @@ suspend fun <BC : BehaviourContext> BC.onGroupChatCreated(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onLeftChatMember(
     initialFilter: SimpleFilter<ChatEventMessage<LeftChatMemberEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<LeftChatMemberEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<LeftChatMemberEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<LeftChatMemberEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<LeftChatMemberEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -361,15 +377,16 @@ suspend fun <BC : BehaviourContext> BC.onLeftChatMember(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onNewChatMembers(
     initialFilter: SimpleFilter<ChatEventMessage<NewChatMembers>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<NewChatMembers>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<NewChatMembers>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<NewChatMembers>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<NewChatMembers>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -380,15 +397,16 @@ suspend fun <BC : BehaviourContext> BC.onNewChatMembers(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onNewChatPhoto(
     initialFilter: SimpleFilter<ChatEventMessage<NewChatPhoto>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<NewChatPhoto>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<NewChatPhoto>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<NewChatPhoto>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<NewChatPhoto>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -399,15 +417,16 @@ suspend fun <BC : BehaviourContext> BC.onNewChatPhoto(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onNewChatTitle(
     initialFilter: SimpleFilter<ChatEventMessage<NewChatTitle>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<NewChatTitle>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<NewChatTitle>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<NewChatTitle>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<NewChatTitle>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -418,15 +437,16 @@ suspend fun <BC : BehaviourContext> BC.onNewChatTitle(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPinnedMessage(
     initialFilter: SimpleFilter<ChatEventMessage<PinnedMessage>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<PinnedMessage>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<PinnedMessage>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<PinnedMessage>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<PinnedMessage>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -437,15 +457,16 @@ suspend fun <BC : BehaviourContext> BC.onPinnedMessage(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onProximityAlertTriggered(
     initialFilter: SimpleFilter<ChatEventMessage<ProximityAlertTriggered>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<ProximityAlertTriggered>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ProximityAlertTriggered>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ProximityAlertTriggered>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<ProximityAlertTriggered>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -456,15 +477,16 @@ suspend fun <BC : BehaviourContext> BC.onProximityAlertTriggered(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onSupergroupChatCreated(
     initialFilter: SimpleFilter<ChatEventMessage<SupergroupChatCreated>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<SupergroupChatCreated>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<SupergroupChatCreated>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<SupergroupChatCreated>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<SupergroupChatCreated>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -478,15 +500,16 @@ suspend fun <BC : BehaviourContext> BC.onSupergroupChatCreated(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onSuccessfulPayment(
     initialFilter: SimpleFilter<ChatEventMessage<SuccessfulPaymentEvent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<SuccessfulPaymentEvent>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<SuccessfulPaymentEvent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<SuccessfulPaymentEvent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<SuccessfulPaymentEvent>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -497,15 +520,16 @@ suspend fun <BC : BehaviourContext> BC.onSuccessfulPayment(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onUserLoggedIn(
     initialFilter: SimpleFilter<ChatEventMessage<UserLoggedIn>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<UserLoggedIn>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<UserLoggedIn>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<UserLoggedIn>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<UserLoggedIn>>
 ) = onEvent(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -516,15 +540,16 @@ suspend fun <BC : BehaviourContext> BC.onUserLoggedIn(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onWebAppData(
     initialFilter: SimpleFilter<PrivateEventMessage<WebAppData>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PrivateEventMessage<WebAppData>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<WebAppData>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<WebAppData>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PrivateEventMessage<WebAppData>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -535,15 +560,16 @@ suspend fun <BC : BehaviourContext> BC.onWebAppData(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onForumTopicClosed(
     initialFilter: SimpleFilter<SupergroupEventMessage<ForumTopicClosed>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, SupergroupEventMessage<ForumTopicClosed>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicClosed>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicClosed>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, SupergroupEventMessage<ForumTopicClosed>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -554,15 +580,16 @@ suspend fun <BC : BehaviourContext> BC.onForumTopicClosed(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onForumTopicCreated(
     initialFilter: SimpleFilter<SupergroupEventMessage<ForumTopicCreated>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, SupergroupEventMessage<ForumTopicCreated>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicCreated>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicCreated>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, SupergroupEventMessage<ForumTopicCreated>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -573,15 +600,16 @@ suspend fun <BC : BehaviourContext> BC.onForumTopicCreated(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onForumTopicReopened(
     initialFilter: SimpleFilter<SupergroupEventMessage<ForumTopicReopened>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, SupergroupEventMessage<ForumTopicReopened>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicReopened>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicReopened>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, SupergroupEventMessage<ForumTopicReopened>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -593,15 +621,16 @@ suspend fun <BC : BehaviourContext> BC.onForumTopicReopened(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onForumTopicEdited(
     initialFilter: SimpleFilter<SupergroupEventMessage<ForumTopicEdited>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, SupergroupEventMessage<ForumTopicEdited>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicEdited>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ForumTopicEdited>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, SupergroupEventMessage<ForumTopicEdited>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -612,15 +641,16 @@ suspend fun <BC : BehaviourContext> BC.onForumTopicEdited(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGeneralForumTopicHidden(
     initialFilter: SimpleFilter<SupergroupEventMessage<GeneralForumTopicHidden>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, SupergroupEventMessage<GeneralForumTopicHidden>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<GeneralForumTopicHidden>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<GeneralForumTopicHidden>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, SupergroupEventMessage<GeneralForumTopicHidden>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -631,15 +661,16 @@ suspend fun <BC : BehaviourContext> BC.onGeneralForumTopicHidden(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onGeneralForumTopicUnhidden(
     initialFilter: SimpleFilter<SupergroupEventMessage<GeneralForumTopicUnhidden>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, SupergroupEventMessage<GeneralForumTopicUnhidden>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<GeneralForumTopicUnhidden>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<GeneralForumTopicUnhidden>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, SupergroupEventMessage<GeneralForumTopicUnhidden>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -651,15 +682,16 @@ suspend fun <BC : BehaviourContext> BC.onGeneralForumTopicUnhidden(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowed(
     initialFilter: SimpleFilter<ChatEventMessage<WriteAccessAllowed>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<WriteAccessAllowed>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<WriteAccessAllowed>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -671,15 +703,16 @@ suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowed(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedFromRequest(
     initialFilter: SimpleFilter<ChatEventMessage<WriteAccessAllowed.FromRequest>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<WriteAccessAllowed.FromRequest>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.FromRequest>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.FromRequest>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<WriteAccessAllowed.FromRequest>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -691,15 +724,16 @@ suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedFromRequest(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedFromAttachmentMenu(
     initialFilter: SimpleFilter<ChatEventMessage<WriteAccessAllowed.FromAttachmentMenu>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<WriteAccessAllowed.FromAttachmentMenu>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.FromAttachmentMenu>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.FromAttachmentMenu>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<WriteAccessAllowed.FromAttachmentMenu>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -711,15 +745,16 @@ suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedFromAttachmentMenu(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedOther(
     initialFilter: SimpleFilter<ChatEventMessage<WriteAccessAllowed.Other>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<WriteAccessAllowed.Other>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.Other>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.Other>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<WriteAccessAllowed.Other>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -731,15 +766,16 @@ suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedOther(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedFromWebAppLink(
     initialFilter: SimpleFilter<ChatEventMessage<WriteAccessAllowed.FromWebAppLink>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<WriteAccessAllowed.FromWebAppLink>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.FromWebAppLink>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<WriteAccessAllowed.FromWebAppLink>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<WriteAccessAllowed.FromWebAppLink>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -752,15 +788,16 @@ suspend fun <BC : BehaviourContext> BC.onWriteAccessAllowedFromWebAppLink(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatSharedRequest(
     initialFilter: SimpleFilter<PrivateEventMessage<ChatSharedRequest>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PrivateEventMessage<ChatSharedRequest>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChatSharedRequest>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChatSharedRequest>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PrivateEventMessage<ChatSharedRequest>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -772,15 +809,16 @@ suspend fun <BC : BehaviourContext> BC.onChatSharedRequest(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onUsersShared(
     initialFilter: SimpleFilter<PrivateEventMessage<UsersShared>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PrivateEventMessage<UsersShared>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<UsersShared>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<UsersShared>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PrivateEventMessage<UsersShared>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -792,15 +830,16 @@ suspend fun <BC : BehaviourContext> BC.onUsersShared(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onUserShared(
     initialFilter: SimpleFilter<PrivateEventMessage<UsersShared>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PrivateEventMessage<UsersShared>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<UsersShared>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<UsersShared>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PrivateEventMessage<UsersShared>>
 ) = onUsersShared(initialFilter * { it.chatEvent.userIds.size == 1 }, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -813,15 +852,16 @@ suspend fun <BC : BehaviourContext> BC.onUserShared(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatShared(
     initialFilter: SimpleFilter<PrivateEventMessage<ChatShared>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PrivateEventMessage<ChatShared>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChatShared>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChatShared>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PrivateEventMessage<ChatShared>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -834,15 +874,16 @@ suspend fun <BC : BehaviourContext> BC.onChatShared(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatBoostAdded(
     initialFilter: SimpleFilter<ChatEventMessage<ChatBoostAdded>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<ChatBoostAdded>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChatBoostAdded>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChatBoostAdded>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<ChatBoostAdded>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -854,14 +895,15 @@ suspend fun <BC : BehaviourContext> BC.onChatBoostAdded(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param markerFactory Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onChatBackgroundSet(
     initialFilter: SimpleFilter<ChatEventMessage<ChatBackground>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ChatEventMessage<ChatBackground>, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in ChatEventMessage<ChatBackground>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in ChatEventMessage<ChatBackground>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ChatEventMessage<ChatBackground>>
 ) = onEventWithCustomChatEventMessage(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/InlineQueryTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/InlineQueryTriggers.kt
index 8106a24084..69518e093f 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/InlineQueryTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/InlineQueryTriggers.kt
@@ -12,7 +12,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : InlineQuery> BC.onInlineQuery(
     initialFilter: SimpleFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = InlineQueryFilterByUser,
-    markerFactory: MarkerFactory<in T, Any> = ByUserInlineQueryMarkerFactory,
+    markerFactory: MarkerFactory<in T, Any>? = ByUserInlineQueryMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.inlineQueryUpdateOrNull() ?.data as? T) ?.let(::listOfNotNull)
@@ -25,15 +25,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : InlineQuery> BC.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onAnyInlineQuery(
     initialFilter: SimpleFilter<InlineQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, InlineQuery, Update>? = InlineQueryFilterByUser,
-    markerFactory: MarkerFactory<in InlineQuery, Any> = ByUserInlineQueryMarkerFactory,
+    markerFactory: MarkerFactory<in InlineQuery, Any>? = ByUserInlineQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, InlineQuery>
 ) = onInlineQuery(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -45,15 +46,16 @@ suspend fun <BC : BehaviourContext> BC.onAnyInlineQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onBaseInlineQuery(
     initialFilter: SimpleFilter<BaseInlineQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, BaseInlineQuery, Update>? = InlineQueryFilterByUser,
-    markerFactory: MarkerFactory<in BaseInlineQuery, Any> = ByUserInlineQueryMarkerFactory,
+    markerFactory: MarkerFactory<in BaseInlineQuery, Any>? = ByUserInlineQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, BaseInlineQuery>
 ) = onInlineQuery(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -65,14 +67,15 @@ suspend fun <BC : BehaviourContext> BC.onBaseInlineQuery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onLocationInlineQuery(
     initialFilter: SimpleFilter<LocationInlineQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, LocationInlineQuery, Update>? = InlineQueryFilterByUser,
-    markerFactory: MarkerFactory<in LocationInlineQuery, Any> = ByUserInlineQueryMarkerFactory,
+    markerFactory: MarkerFactory<in LocationInlineQuery, Any>? = ByUserInlineQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, LocationInlineQuery>
 ) = onInlineQuery(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MainTrigger.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MainTrigger.kt
index 80c386c70c..1492cacaa1 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MainTrigger.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MainTrigger.kt
@@ -1,5 +1,7 @@
 package dev.inmo.tgbotapi.extensions.behaviour_builder.triggers_handling
 
+import dev.inmo.micro_utils.coroutines.launchSafelyWithoutExceptions
+import dev.inmo.micro_utils.coroutines.subscribeSafelyWithoutExceptions
 import dev.inmo.micro_utils.coroutines.subscribeSafelyWithoutExceptionsAsync
 import dev.inmo.tgbotapi.extensions.behaviour_builder.*
 import dev.inmo.tgbotapi.extensions.behaviour_builder.expectations.expectFlow
@@ -7,12 +9,12 @@ import dev.inmo.tgbotapi.extensions.behaviour_builder.utils.SimpleFilter
 import dev.inmo.tgbotapi.extensions.behaviour_builder.utils.marker_factories.MarkerFactory
 import dev.inmo.tgbotapi.types.update.abstracts.Update
 
-internal suspend inline fun <BC : BehaviourContext, reified T> BC.on(
-    markerFactory: MarkerFactory<in T, Any>,
+internal suspend fun <BC : BehaviourContext, T> BC.on(
+    markerFactory: MarkerFactory<in T, Any>?,
     initialFilter: SimpleFilter<T>? = null,
-    noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = null,
-    noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>,
-    noinline updateToData: (Update) -> List<T>?
+    subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = null,
+    scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>,
+    updateToData: (Update) -> List<T>?
 ) = flowsUpdatesFilter.expectFlow(
     bot,
     filter = initialFilter ?.let {
@@ -22,19 +24,31 @@ internal suspend inline fun <BC : BehaviourContext, reified T> BC.on(
             } ?: emptyList()
         }
     } ?: {
-        updateToData(it) ?.mapNotNull { data ->
+        updateToData(it) ?.map { data ->
             it to data
         } ?: emptyList()
     }
-).subscribeSafelyWithoutExceptionsAsync(
-    scope,
-    { markerFactory(it.second) }
-) { (update, triggerData) ->
-    createSubContextAndDoWithUpdatesFilter(
-        stopOnCompletion = false
-    ) {
-        if (subcontextUpdatesFilter ?.invoke(this, triggerData, update) != false) {
-            scenarioReceiver(triggerData)
+).run {
+    val handler: suspend (Pair<Update, T>) -> Unit = subcontextUpdatesFilter ?.let {
+        { (update, triggerData) ->
+            createSubContextAndDoWithUpdatesFilter {
+                if (subcontextUpdatesFilter(this, triggerData, update)) {
+                    scenarioReceiver(triggerData)
+                }
+            }
+        }
+    } ?: { (_, triggerData) ->
+        createSubContextAndDoWithUpdatesFilter(behaviourContextReceiver = { scenarioReceiver(triggerData) })
+    }
+    markerFactory ?.let {
+        subscribeSafelyWithoutExceptionsAsync(
+            scope,
+            { markerFactory(it.second) },
+            block = handler
+        )
+    } ?: subscribeSafelyWithoutExceptions(scope) {
+        scope.launchSafelyWithoutExceptions {
+            handler(it)
         }
     }
 }
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupMessagesTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupMessagesTriggers.kt
index b4f80f4fd5..ef23f4913d 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupMessagesTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupMessagesTriggers.kt
@@ -18,7 +18,7 @@ import dev.inmo.tgbotapi.utils.PreviewFeature
 internal suspend inline fun <BC : BehaviourContext, reified T : MediaGroupPartContent> BC.buildMediaGroupMessagesTrigger(
     initialFilter: SimpleFilter<MediaGroupMessage<T>>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<T>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<T>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<T>, Any>? = ByChatMessageMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<T>>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     it.baseSentMessageUpdateOrNull() ?.data ?.commonMessageOrNull() ?.withContentOrNull<MediaGroupContent<*>>() ?.let {
@@ -37,15 +37,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : MediaGroupPartCo
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMediaGroupMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<MediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<MediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<MediaGroupPartContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<MediaGroupPartContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<MediaGroupPartContent>>
 ) = buildMediaGroupMessagesTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -56,15 +57,16 @@ suspend fun <BC : BehaviourContext> BC.onMediaGroupMessages(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPlaylistMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<AudioMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<AudioMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<AudioMediaGroupPartContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<AudioMediaGroupPartContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<AudioMediaGroupPartContent>>
 ) = buildMediaGroupMessagesTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -75,15 +77,16 @@ suspend fun <BC : BehaviourContext> BC.onPlaylistMessages(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDocumentsGroupMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<DocumentMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<DocumentMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<DocumentMediaGroupPartContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<DocumentMediaGroupPartContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<DocumentMediaGroupPartContent>>
 ) = buildMediaGroupMessagesTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -94,15 +97,16 @@ suspend fun <BC : BehaviourContext> BC.onDocumentsGroupMessages(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVisualGalleryMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<VisualMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<VisualMediaGroupPartContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<VisualMediaGroupPartContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<VisualMediaGroupPartContent>>
 ) = buildMediaGroupMessagesTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -113,15 +117,16 @@ suspend fun <BC : BehaviourContext> BC.onVisualGalleryMessages(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVisualMediaGroupMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<VisualMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<VisualMediaGroupPartContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<VisualMediaGroupPartContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<VisualMediaGroupPartContent>>
 ) = onVisualGalleryMessages(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -132,15 +137,16 @@ suspend fun <BC : BehaviourContext> BC.onVisualMediaGroupMessages(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPhotoGalleryMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<PhotoContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<PhotoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<PhotoContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<PhotoContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<PhotoContent>>
 ) = buildMediaGroupMessagesTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -151,14 +157,15 @@ suspend fun <BC : BehaviourContext> BC.onPhotoGalleryMessages(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoGalleryMessages(
     initialFilter: SimpleFilter<MediaGroupMessage<VideoContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupMessage<VideoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupMessage<VideoContent>, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in MediaGroupMessage<VideoContent>, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupMessage<VideoContent>>
 ) = buildMediaGroupMessagesTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupTriggers.kt
index 16057119ae..ec5ea5f21b 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MediaGroupTriggers.kt
@@ -18,7 +18,7 @@ import dev.inmo.tgbotapi.utils.PreviewFeature
 internal suspend inline fun <BC : BehaviourContext, reified T : MediaGroupPartContent> BC.buildMediaGroupTrigger(
     initialFilter: SimpleFilter<MediaGroupContent<T>>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<T>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<T>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<T>, Any>? = AnyMarkerFactory(),
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<T>>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     it.baseSentMessageUpdateOrNull() ?.data ?.commonMessageOrNull() ?.withContentOrNull<MediaGroupContent<*>>() ?.let {
@@ -37,15 +37,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : MediaGroupPartCo
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onMediaGroup(
     initialFilter: SimpleFilter<MediaGroupContent<MediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<MediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<MediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<MediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<MediaGroupPartContent>>
 ) = buildMediaGroupTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -56,15 +57,16 @@ suspend fun <BC : BehaviourContext> BC.onMediaGroup(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPlaylist(
     initialFilter: SimpleFilter<MediaGroupContent<AudioMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<AudioMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<AudioMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<AudioMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<AudioMediaGroupPartContent>>
 ) = buildMediaGroupTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -75,15 +77,16 @@ suspend fun <BC : BehaviourContext> BC.onPlaylist(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onDocumentsGroup(
     initialFilter: SimpleFilter<MediaGroupContent<DocumentMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<DocumentMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<DocumentMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<DocumentMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<DocumentMediaGroupPartContent>>
 ) = buildMediaGroupTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -94,15 +97,16 @@ suspend fun <BC : BehaviourContext> BC.onDocumentsGroup(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVisualGallery(
     initialFilter: SimpleFilter<MediaGroupContent<VisualMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<VisualMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<VisualMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<VisualMediaGroupPartContent>>
 ) = buildMediaGroupTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -113,15 +117,16 @@ suspend fun <BC : BehaviourContext> BC.onVisualGallery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVisualMediaGroup(
     initialFilter: SimpleFilter<MediaGroupContent<VisualMediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<VisualMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<VisualMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<VisualMediaGroupPartContent>>
 ) = onVisualGallery(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -132,15 +137,16 @@ suspend fun <BC : BehaviourContext> BC.onVisualMediaGroup(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPhotoGallery(
     initialFilter: SimpleFilter<MediaGroupContent<PhotoContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<PhotoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<PhotoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<PhotoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<PhotoContent>>
 ) = buildMediaGroupTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
@@ -151,14 +157,15 @@ suspend fun <BC : BehaviourContext> BC.onPhotoGallery(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onVideoGallery(
     initialFilter: SimpleFilter<MediaGroupContent<VideoContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, MediaGroupContent<VideoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in MediaGroupContent<VideoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in MediaGroupContent<VideoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, MediaGroupContent<VideoContent>>
 ) = buildMediaGroupTrigger(initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MentionTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MentionTriggers.kt
index 1acc11d2dc..f93ac56d7f 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MentionTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/MentionTriggers.kt
@@ -29,7 +29,7 @@ internal suspend inline fun <BC : BehaviourContext, reified T : TextedContent> B
     username: Username,
     initialFilter: CommonMessageFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<T>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<T>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<T>, Any>? = AnyMarkerFactory(),
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<T>>
 ) = onContentMessageWithType<BC, T>(
     initialFilter * {
@@ -44,7 +44,7 @@ internal suspend inline fun <BC : BehaviourContext, reified T : TextedContent> B
     userId: UserId,
     initialFilter: CommonMessageFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<T>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<T>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<T>, Any>? = AnyMarkerFactory(),
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<T>>
 ) = onContentMessageWithType<BC, T>(
     initialFilter * {
@@ -59,7 +59,7 @@ internal suspend inline fun <BC : BehaviourContext, reified T : TextedContent> B
     user: User,
     initialFilter: CommonMessageFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<T>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<T>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<T>, Any>? = AnyMarkerFactory(),
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<T>>
 ) = onContentMessageWithType<BC, T>(
     initialFilter * {
@@ -71,287 +71,452 @@ internal suspend inline fun <BC : BehaviourContext, reified T : TextedContent> B
 )
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithAnyContent(
     username: Username,
     initialFilter: CommonMessageFilter<TextedContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<TextedContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<TextedContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<TextedContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<TextedContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithAnyContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<TextedContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<TextedContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<TextedContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<TextedContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<TextedContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithAnyContent(
     user: User,
     initialFilter: CommonMessageFilter<TextedContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<TextedContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<TextedContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<TextedContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<TextedContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithVoiceContent(
     username: Username,
     initialFilter: CommonMessageFilter<VoiceContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VoiceContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VoiceContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VoiceContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VoiceContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithVoiceContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<VoiceContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VoiceContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VoiceContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VoiceContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VoiceContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithVoiceContent(
     user: User,
     initialFilter: CommonMessageFilter<VoiceContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VoiceContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VoiceContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VoiceContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VoiceContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithMediaGroupContent(
     username: Username,
     initialFilter: CommonMessageFilter<MediaGroupContent<MediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MediaGroupContent<MediaGroupPartContent>>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithMediaGroupContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<MediaGroupContent<MediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MediaGroupContent<MediaGroupPartContent>>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithMediaGroupContent(
     user: User,
     initialFilter: CommonMessageFilter<MediaGroupContent<MediaGroupPartContent>>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<MediaGroupContent<MediaGroupPartContent>>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MediaGroupContent<MediaGroupPartContent>>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithMediaGroupPartContent(
     username: Username,
     initialFilter: CommonMessageFilter<MediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MediaGroupPartContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithMediaGroupPartContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<MediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MediaGroupPartContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithMediaGroupPartContent(
     user: User,
     initialFilter: CommonMessageFilter<MediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<MediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<MediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<MediaGroupPartContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithAudioContent(
     username: Username,
     initialFilter: CommonMessageFilter<AudioContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<AudioContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<AudioContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<AudioContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<AudioContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithAudioContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<AudioContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<AudioContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<AudioContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<AudioContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<AudioContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithAudioContent(
     user: User,
     initialFilter: CommonMessageFilter<AudioContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<AudioContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<AudioContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<AudioContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<AudioContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithDocumentContent(
     username: Username,
     initialFilter: CommonMessageFilter<DocumentContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<DocumentContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<DocumentContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<DocumentContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<DocumentContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithDocumentContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<DocumentContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<DocumentContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<DocumentContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<DocumentContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<DocumentContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithDocumentContent(
     user: User,
     initialFilter: CommonMessageFilter<DocumentContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<DocumentContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<DocumentContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<DocumentContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<DocumentContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithVisualMediaGroupPartContent(
     username: Username,
     initialFilter: CommonMessageFilter<VisualMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VisualMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VisualMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VisualMediaGroupPartContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithVisualMediaGroupPartContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<VisualMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VisualMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VisualMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VisualMediaGroupPartContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithVisualMediaGroupPartContent(
     user: User,
     initialFilter: CommonMessageFilter<VisualMediaGroupPartContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VisualMediaGroupPartContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VisualMediaGroupPartContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VisualMediaGroupPartContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VisualMediaGroupPartContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithVideoContent(
     username: Username,
     initialFilter: CommonMessageFilter<VideoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VideoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VideoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VideoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VideoContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithVideoContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<VideoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VideoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VideoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VideoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VideoContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithVideoContent(
     user: User,
     initialFilter: CommonMessageFilter<VideoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<VideoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<VideoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<VideoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<VideoContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithPhotoContent(
     username: Username,
     initialFilter: CommonMessageFilter<PhotoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<PhotoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<PhotoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<PhotoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<PhotoContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithPhotoContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<PhotoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<PhotoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<PhotoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<PhotoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<PhotoContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithPhotoContent(
     user: User,
     initialFilter: CommonMessageFilter<PhotoContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<PhotoContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<PhotoContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<PhotoContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<PhotoContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithAnimationContent(
     username: Username,
     initialFilter: CommonMessageFilter<AnimationContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<AnimationContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<AnimationContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<AnimationContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<AnimationContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithAnimationContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<AnimationContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<AnimationContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<AnimationContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<AnimationContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<AnimationContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithAnimationContent(
     user: User,
     initialFilter: CommonMessageFilter<AnimationContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<AnimationContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<AnimationContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<AnimationContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<AnimationContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
 
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithTextContent(
     username: Username,
     initialFilter: CommonMessageFilter<TextContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<TextContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<TextContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<TextContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<TextContent>>
 ) = onMention(username, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onTextMentionWithTextContent(
     userId: UserId,
     initialFilter: CommonMessageFilter<TextContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<TextContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<TextContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<TextContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<TextContent>>
 ) = onTextMention(userId, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
+/**
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
+ */
 suspend fun <BC : BehaviourContext> BC.onMentionWithTextContent(
     user: User,
     initialFilter: CommonMessageFilter<TextContent>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, CommonMessage<TextContent>, Update>? = null,
-    markerFactory: MarkerFactory<in CommonMessage<TextContent>, Any> = AnyMarkerFactory(),
+    markerFactory: MarkerFactory<in CommonMessage<TextContent>, Any>? = AnyMarkerFactory(),
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, CommonMessage<TextContent>>
 ) = onMention(user, initialFilter, subcontextUpdatesFilter, markerFactory, scenarioReceiver)
 
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PassportTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PassportTriggers.kt
index b4cd034da8..608690b12f 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PassportTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PassportTriggers.kt
@@ -14,7 +14,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : EncryptedPassportElement> BC.onPassportMessageWith(
     initialFilter: SimpleFilter<PassportMessage>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PassportMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in PassportMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in PassportMessage, Any>? = ByChatMessageMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PassportMessage>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.messageUpdateOrNull() ?.data ?.passportMessageOrNull() ?.takeIf { it.passportData.data.any { it is T } }) ?.let(::listOfNotNull)
@@ -28,15 +28,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : EncryptedPasspor
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPassportMessage(
     initialFilter: SimpleFilter<PassportMessage>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PassportMessage, Update>? = MessageFilterByChat,
-    markerFactory: MarkerFactory<in PassportMessage, Any> = ByChatMessageMarkerFactory,
+    markerFactory: MarkerFactory<in PassportMessage, Any>? = ByChatMessageMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PassportMessage>
 ) = onPassportMessageWith<BC, EncryptedPassportElement>(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollAnswersTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollAnswersTriggers.kt
index a09639754b..25aacba2f8 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollAnswersTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollAnswersTriggers.kt
@@ -13,7 +13,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext> BC.onPollAnswered(
     initialFilter: SimpleFilter<PollAnswer>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PollAnswer, Update>? = null,
-    markerFactory: MarkerFactory<in PollAnswer, Any> = ByIdPollAnswerMarkerFactory,
+    markerFactory: MarkerFactory<in PollAnswer, Any>? = ByIdPollAnswerMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PollAnswer>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.pollAnswerUpdateOrNull() ?.data) ?.let(::listOfNotNull)
@@ -26,15 +26,16 @@ internal suspend inline fun <BC : BehaviourContext> BC.onPollAnswered(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPollAnswer(
     initialFilter: SimpleFilter<PollAnswer>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PollAnswer, Update>? = null,
-    markerFactory: MarkerFactory<in PollAnswer, Any> = ByIdPollAnswerMarkerFactory,
+    markerFactory: MarkerFactory<in PollAnswer, Any>? = ByIdPollAnswerMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PollAnswer>
 ) = onPollAnswered(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollUpdatesTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollUpdatesTriggers.kt
index c9098d600d..f7ce9810b5 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollUpdatesTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PollUpdatesTriggers.kt
@@ -13,7 +13,7 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
 internal suspend inline fun <BC : BehaviourContext, reified T : Poll> BC.onPollUpdatedBase(
     initialFilter: SimpleFilter<T>? = null,
     noinline subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, T, Update>? = null,
-    markerFactory: MarkerFactory<in T, Any> = ByIdPollMarkerFactory,
+    markerFactory: MarkerFactory<in T, Any>? = ByIdPollMarkerFactory,
     noinline scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, T>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.pollUpdateOrNull() ?.data as? T) ?.let(::listOfNotNull)
@@ -26,15 +26,16 @@ internal suspend inline fun <BC : BehaviourContext, reified T : Poll> BC.onPollU
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPollUpdates(
     initialFilter: SimpleFilter<Poll>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, Poll, Update>? = null,
-    markerFactory: MarkerFactory<in Poll, Any> = ByIdPollMarkerFactory,
+    markerFactory: MarkerFactory<in Poll, Any>? = ByIdPollMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, Poll>
 ) = onPollUpdatedBase(
     initialFilter,
@@ -50,15 +51,16 @@ suspend fun <BC : BehaviourContext> BC.onPollUpdates(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onRegularPollUpdates(
     initialFilter: SimpleFilter<RegularPoll>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, RegularPoll, Update>? = null,
-    markerFactory: MarkerFactory<in RegularPoll, Any> = ByIdPollMarkerFactory,
+    markerFactory: MarkerFactory<in RegularPoll, Any>? = ByIdPollMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, RegularPoll>
 ) = onPollUpdatedBase(
     initialFilter,
@@ -74,15 +76,16 @@ suspend fun <BC : BehaviourContext> BC.onRegularPollUpdates(
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onQuizPollUpdates(
     initialFilter: SimpleFilter<QuizPoll>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, QuizPoll, Update>? = null,
-    markerFactory: MarkerFactory<in QuizPoll, Any> = ByIdPollMarkerFactory,
+    markerFactory: MarkerFactory<in QuizPoll, Any>? = ByIdPollMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, QuizPoll>
 ) = onPollUpdatedBase(
     initialFilter,
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PreCheckoutQueryTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PreCheckoutQueryTriggers.kt
index c53f1ecda0..8b2bb853e7 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PreCheckoutQueryTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/PreCheckoutQueryTriggers.kt
@@ -20,15 +20,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onPreCheckoutQuery(
     initialFilter: SimpleFilter<PreCheckoutQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, PreCheckoutQuery, Update>? = PreCheckoutQueryFilterByUser,
-    markerFactory: MarkerFactory<in PreCheckoutQuery, Any> = ByUserPreCheckoutQueryMarkerFactory,
+    markerFactory: MarkerFactory<in PreCheckoutQuery, Any>? = ByUserPreCheckoutQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, PreCheckoutQuery>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.preCheckoutQueryUpdateOrNull() ?.data) ?.let(::listOfNotNull)
diff --git a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ShippingQueryTriggers.kt b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ShippingQueryTriggers.kt
index 1f82cf12cb..bc2aa01ba5 100644
--- a/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ShippingQueryTriggers.kt
+++ b/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/triggers_handling/ShippingQueryTriggers.kt
@@ -20,15 +20,16 @@ import dev.inmo.tgbotapi.types.update.abstracts.Update
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.BehaviourContextAndTwoTypesReceiver] function to create your own.
  * Use [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.plus] or [dev.inmo.tgbotapi.extensions.behaviour_builder.utils.times]
  * to combinate several filters
- * @param [markerFactory] Will be used to identify different "stream". [scenarioReceiver] will be called synchronously
- * in one "stream". Output of [markerFactory] will be used as a key for "stream"
+ * @param [markerFactory] **Pass null to handle requests fully parallel**. Will be used to identify different "stream".
+ * [scenarioReceiver] will be called synchronously in one "stream". Output of [markerFactory] will be used as a key for
+ * "stream"
  * @param scenarioReceiver Main callback which will be used to handle incoming data if [initialFilter] will pass that
  * data
  */
 suspend fun <BC : BehaviourContext> BC.onShippingQuery(
     initialFilter: SimpleFilter<ShippingQuery>? = null,
     subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, ShippingQuery, Update>? = ShippingQueryFilterByUser,
-    markerFactory: MarkerFactory<in ShippingQuery, Any> = ByUserShippingQueryMarkerFactory,
+    markerFactory: MarkerFactory<in ShippingQuery, Any>? = ByUserShippingQueryMarkerFactory,
     scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, ShippingQuery>
 ) = on(markerFactory, initialFilter, subcontextUpdatesFilter, scenarioReceiver) {
     (it.shippingQueryUpdateOrNull() ?.data) ?.let(::listOfNotNull)