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So would it be possible to use the pure-Python implementation with PyPy without having to resort to Reflex et al?

To my best understanding, the pure Python implementation is much slower. Even on PyPy.

I did not know that Protobuf 3 is compatible with Protobuf 2.

I read that as Protobuf 3.0 supports proto2, which is different than proto3 being compatible with proto2.