msgpack/msgpack-python — pull request #17 by jnothman (2012-09-21 06:03:49+00:00)
Title: Expose packed stream with Unpacker.read_bytes()

At present, Unpacker buffers reading from the stream, meaning the stream can no longer be read directly. Unpacker.read_bytes(n) provides access to the underlying data, allowing content of known size to be read without unpacking.