Internal Program Version: u-msgpack-python  2.7.2

u-msgpack-python is a lightweight MessagePack serializer and
deserializer module written in pure Python, compatible with both
Python 2 and Python 3, as well as CPython and PyPy implementations of
Python. u-msgpack-python is fully compliant with the latest
MessagePack specification. In particular, it supports the new binary,
UTF-8 string, and application-defined ext types.

https://github.com/vsergeev/u-msgpack-python