[issue28339] "TypeError: Parameterized generics cannot be used with class or instance checks" in test_functools after importing typing module

[Wilfred Hughes]

Wilfred Hughes <yowilf...@gmail.com> added the comment:

Note that this also affects the singledispatch library that backports 
singledispatch to Python 2: https://github.com/python/typing/issues/484

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nosy: +Wilfred.Hughes

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