[issue46032] functools' singledispatch does not support GenericAlias

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

The PR looks good to me. I think it's also important that we document that these types aren't supported, as it's not mentioned anywhere at the moment. Related: Issue34498.

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nosy: +uriyyo

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