Apologies - here is the link to the docs, referring to the Python C++ as 
experimental:
https://developers.google.com/protocol-buffers/docs/reference/python-generated#cpp_impl
Scroll down to the bottom:
"There is also an **experimental** C++ implementation for Python messages via a 
Python extension for better performance. Implementation type is controlled by 
an environment variable PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION (valid values: 
"cpp" and "python"). The default value is currently "python" but will be 
changed to "cpp" in future release.
Note that the environment variable needs to be set before installing the 
protobuf library, in order to build and install the python extension. The C++ 
implementation also requires CPython platforms. See python/INSTALL.txt for 
detailed install instructions."
This is a test disclaimer.

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