This document describes the implementation of MsgPack-CLI design and implementation for it.

The de-facto standard interpretation of MessagePack specification is that a Unicode string should be encoded as UTF-8 without BOM and stored on Raw type.

MsgPack-CLI is implemented as following:

• Packer packs String (or Char sequence) as UTF-8 bytes on Raw type. Note that Packer provides overloaded methods which accepts System.Text.Encoding to specify custom character encoding.
• Unpacker and MessagePackObject handles Raw type value as byte[], and they provide ReadString or AsString methods which handle character decoding from unpacked Raw type value.
• MessagePackSerializer<T> uses above primitive APIs as following rules:
• If target field or property is String type, then UTF-8 encoding will be used. If deserializing stream contains invalid byte sequence as UTF-8, an exception is thrown.
• If target field or property is Byte[] type, then raw bytes will be stored as is.
• If you want to handle other encoding like Latin-1 string, Shift-JIS string etc., you must build custom serializer by hand.