a close reading of the pickle module #12971
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I didn't go in planning to split the C
_pickle.Picker
and pythonpickle._Pickler
implementations, but then the _Pickler-only classvar was there and I didn't like copying that into _pickle.pyi.Pickler.memo and Unpickler.memo I went as far as I did with it because of the comment here: https://github.com/python/cpython/blob/3.12/Modules/_pickle.c#L4839
which pretty strongly implies that somebody out there is using it.