[issue10667] collections.Counter object in C

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

When adding some C accelerations, we often try to keep a pure Python alternative in the stdlib, since it can then benefit other Python implementations (and easy prototyping).

If you move some of the methods inside a mixin and use multiple inheritance with the base C impl, this should be easy.
Also, the unit tests should then test both the C impl and the pure Python impl.

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nosy: +pitrou

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