downgrade kotlin and fix build

startup/plugin/src/commonMain/kotlin/StartPluginSerializer.kt

@@ -1,5 +1,42 @@
 package dev.inmo.micro_utils.startup.plugin
 
+import com.benasher44.uuid.uuid4
 import kotlinx.serialization.KSerializer
+import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
 
-expect object StartPluginSerializer : KSerializer<StartPlugin>
+object StartPluginSerializer : KSerializer<StartPlugin> {
+    private val registeredPlugins = mutableMapOf<String, StartPlugin>()
+    private val registeredPluginsByPlugin = mutableMapOf<StartPlugin, String>()
+    override val descriptor: SerialDescriptor = String.serializer().descriptor
+
+    override fun deserialize(decoder: Decoder): StartPlugin {
+        alternativeDeserialize(decoder) ?.let { return it }
+        val name = decoder.decodeString()
+        return registeredPlugins[name] ?: error("Unable to find startup plugin for $name")
+    }
+
+    override fun serialize(encoder: Encoder, value: StartPlugin) {
+        if (alternativeSerialize(encoder, value)) {
+            return
+        }
+        val name = registeredPluginsByPlugin[value] ?: uuid4().toString().also {
+            registeredPlugins[it] = value
+            registeredPluginsByPlugin[value] = it
+        }
+        encoder.encodeString(name)
+    }
+
+    /**
+     * Register plugin inside of this [KSerializer]. Since plugin has been registered, you may use its [name] in any
+     * serialized [dev.inmo.micro_utils.startup.launcher.Config] to retrieve [plugin] you passed here
+     */
+    fun registerPlugin(name: String, plugin: StartPlugin) {
+        registeredPlugins[name] = plugin
+    }
+}
+
+internal expect fun alternativeDeserialize(decoder: Decoder): StartPlugin?
+internal expect fun alternativeSerialize(encoder: Encoder, value: StartPlugin): Boolean