Add UByteArray as "bytes" serializer, just like ByteArray

Author: KosmX

formats/protobuf/commonMain/src/kotlinx/serialization/protobuf/internal/ProtobufDecoding.kt

@@ -242,6 +242,7 @@ internal open class ProtobufDecoder(
 
     override fun <T> decodeSerializableValue(deserializer: DeserializationStrategy<T>): T = decodeSerializableValue(deserializer, null)
 
+    @OptIn(ExperimentalUnsignedTypes::class)
     @Suppress("UNCHECKED_CAST")
     override fun <T> decodeSerializableValue(deserializer: DeserializationStrategy<T>, previousValue: T?): T = try {
         when {
@@ -250,6 +251,7 @@ internal open class ProtobufDecoder(
             }
 
             deserializer.descriptor == ByteArraySerializer().descriptor -> deserializeByteArray(previousValue as ByteArray?) as T
+            deserializer.descriptor == UByteArraySerializer().descriptor -> deserializeByteArray((previousValue as UByteArray?)?.asByteArray()).asUByteArray() as T
             deserializer is AbstractCollectionSerializer<*, *, *> ->
                 (deserializer as AbstractCollectionSerializer<*, T, *>).merge(this, previousValue)
 

formats/protobuf/commonMain/src/kotlinx/serialization/protobuf/internal/ProtobufEncoding.kt

@@ -138,11 +138,13 @@ internal open class ProtobufEncoder(
 
     override fun SerialDescriptor.getTag(index: Int) = extractParameters(index)
 
+    @OptIn(ExperimentalUnsignedTypes::class)
     override fun <T> encodeSerializableValue(serializer: SerializationStrategy<T>, value: T) = when {
         serializer is MapLikeSerializer<*, *, *, *> -> {
             serializeMap(serializer as SerializationStrategy<T>, value)
         }
         serializer.descriptor == ByteArraySerializer().descriptor -> serializeByteArray(value as ByteArray)
+        serializer.descriptor == UByteArraySerializer().descriptor -> serializeByteArray((value as UByteArray).asByteArray())
         else -> serializer.serialize(this, value)
     }