Hide Message serializers and postpone implementations later

mirai-core-api/src/commonMain/kotlin/message/MessageSerializer.kt

@@ -166,6 +166,7 @@ private val builtInSerializersModule by lazy {
             subclass(FlashImage::class, FlashImage.serializer())
         }
 
+        @Suppress("DEPRECATION_ERROR")
         contextual(Message::class, Message.Serializer)
         // contextual(SingleMessage::class, SingleMessage.Serializer)
         contextual(MessageChain::class, MessageChain.Serializer)

mirai-core-api/src/commonMain/kotlin/message/data/Message.kt

@@ -73,6 +73,7 @@ import kotlin.internal.LowPriorityInOverloadResolution
  *
  * @see Contact.sendMessage 发送消息
  */
+@Suppress("DEPRECATION_ERROR")
 @Serializable(Message.Serializer::class)
 public interface Message { // must be interface. Don't consider any changes.
 
@@ -197,15 +198,18 @@ public interface Message { // must be interface. Don't consider any changes.
     public operator fun plus(another: Sequence<Message>): MessageChain =
         another.fold(this, Message::plus).asMessageChain()
 
+    @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
     public object Serializer :
         MessageSerializer by MessageSerializerImpl,
         KSerializer<Message> by PolymorphicSerializer(Message::class)
 
+    @Suppress("DEPRECATION_ERROR")
     public companion object {
         /**
          * 从 JSON 字符串解析 [Message]
          * @see serializeToJsonString
          */
+        @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
         @JvmOverloads
         @JvmStatic
         public fun deserializeFromJsonString(
@@ -219,6 +223,7 @@ public interface Message { // must be interface. Don't consider any changes.
          * 将 [Message] 序列化为 JSON 字符串.
          * @see deserializeFromJsonString
          */
+        @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
         @JvmOverloads
         @JvmStatic
         public fun Message.serializeToJsonString(
@@ -231,6 +236,7 @@ public interface Message { // must be interface. Don't consider any changes.
          * @see serializeToJsonString
          * @see StringFormat.encodeToString
          */
+        @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
         @ExperimentalSerializationApi
         @JvmStatic
         public fun Message.serializeToString(format: StringFormat): String =

mirai-core-api/src/commonMain/kotlin/message/data/MessageChain.kt

@@ -93,7 +93,8 @@ public interface MessageChain : Message, List<SingleMessage>, RandomAccess, Coda
         asSequence().any { key.safeCast.invoke(it) != null }
 
     public object Serializer : KSerializer<MessageChain> {
-        private val delegate = ListSerializer(Message.Serializer)
+        @Suppress("DEPRECATION_ERROR")
+        private val delegate = ListSerializer<Message>(Message.Serializer)
         override val descriptor: SerialDescriptor = delegate.descriptor
         override fun deserialize(decoder: Decoder): MessageChain = delegate.deserialize(decoder).asMessageChain()
         override fun serialize(encoder: Encoder, value: MessageChain): Unit = delegate.serialize(encoder, value)
@@ -103,11 +104,13 @@ public interface MessageChain : Message, List<SingleMessage>, RandomAccess, Coda
         forEach { it.safeCast<CodableMessage>()?.appendMiraiCode(builder) }
     }
 
+    @Suppress("DEPRECATION_ERROR")
     public companion object {
         /**
          * 从 JSON 字符串解析 [MessageChain]
          * @see serializeToJsonString
          */
+        @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
         @JvmOverloads
         @JvmStatic
         public fun deserializeFromJsonString(
@@ -121,6 +124,7 @@ public interface MessageChain : Message, List<SingleMessage>, RandomAccess, Coda
          * 将 [MessageChain] 序列化为 JSON 字符串.
          * @see deserializeFromJsonString
          */
+        @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
         @JvmOverloads
         @JvmStatic
         public fun MessageChain.serializeToJsonString(
@@ -133,6 +137,7 @@ public interface MessageChain : Message, List<SingleMessage>, RandomAccess, Coda
          * @see serializeToJsonString
          * @see StringFormat.encodeToString
          */
+        @Deprecated("消息序列化仍未稳定，请在 2.0-RC 再使用", level = DeprecationLevel.HIDDEN)
         @ExperimentalSerializationApi
         @JvmStatic
         public fun MessageChain.serializeToString(format: StringFormat): String =

mirai-core/src/commonMain/kotlin/MiraiImpl.kt

@@ -46,7 +46,7 @@ import kotlin.random.Random
 // not object for ServiceLoader.
 internal open class MiraiImpl : IMirai, LowLevelApiAccessor {
     companion object INSTANCE : MiraiImpl() {
-        @Suppress("ObjectPropertyName", "unused")
+        @Suppress("ObjectPropertyName", "unused", "DEPRECATION_ERROR")
         private val _init = Mirai.let {
             CIO // init
             Message.Serializer.registerSerializer(OfflineGroupImage::class, OfflineGroupImage.serializer())

mirai-core/src/jvmTest/kotlin/message/data/MessageSerializationTest.kt

@@ -21,6 +21,7 @@ import org.junit.jupiter.api.Test
 import kotlin.test.assertEquals
 
 internal class MessageSerializationTest {
+    @Suppress("DEPRECATION_ERROR")
     private val module get() = Message.Serializer.serializersModule
     private val format
         get() = Json {