[issue38298] Base class of generic type has wrong `cls` argument in classmethods

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

For performance reasons the implementation of generics changed completely in 3.7. I don't think we can restore the behavior you observed in 3.6.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38298>
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