Fix MessagePackSerializer.Capability does not work correctly in Unity.

Author: yfakariya

CHANGES.txt

@@ -656,3 +656,4 @@ Release 0.9.0 RC1 T.B.D
   * Fix constructor deserialization fails if the constructor parameters order is not lexical. Issue #233
   * Fix asynchronous multi dimensional array deserialization corruption.
   * Fix enum serialization throws NullReferenceException in Unity. Issue #215.
+  * Fix MessagePackSerializer.Capability does not work correctly in Unity.

src/MsgPack.Unity.Full/Serialization/TypedMessagePackSerializerWrapper`1.cs

@@ -32,7 +32,7 @@
 namespace MsgPack.Serialization
 {
 	/// <summary>
-	///		Wraps non-generic <see cref="IMessagePackSingleObjectSerializer"/> to avoid AOT issue.
+	///		Wraps non-generic <see cref="MessagePackSerializer"/> to avoid AOT issue.
 	/// </summary>
 	/// <typeparam name="T">The type to be serialized.</typeparam>
 	internal class TypedMessagePackSerializerWrapper<T> : MessagePackSerializer<T>, ICollectionInstanceFactory
@@ -47,6 +47,11 @@ public TypedMessagePackSerializerWrapper( SerializationContext context, MessageP
 			this._underlyingFactory = underlying as ICollectionInstanceFactory;
 		}
 
+		internal override SerializerCapabilities InternalGetCapabilities()
+		{
+			return this._underlyingSerializer.InternalGetCapabilities();
+		}
+
 		protected internal override void PackToCore( Packer packer, T objectTree )
 		{
 			this._underlyingSerializer.PackTo( packer, objectTree );