msgpack/msgpack-smalltalk — pull request #1 by mumez (2013-02-17 16:02:00+00:00)
Title: Added new encoding mode - #unknownAsNil and #loose.

- If encodeMode is #unknownAsNil, unknown types(classes) will be encoded as nil values.
- If encodeMode is #loose, #asMpConverted will be sent to the unknown class's instances. You can override the method to convert your instance as MessagePack-compatible value. For example, this mode allows encoding IdentityDictionary as MessagePack map.