[issue34498] Python 3.7 breaks on singledispatch_function.register(pseudo_type), which Python 3.6 accepted
Łukasz Langa
report at bugs.python.org
Tue Aug 28 08:58:02 EDT 2018
Łukasz Langa <lukasz at langa.pl> added the comment:
> I would say we could update the check in `functools` to accept more things.
Could we revert abstract types in `typing` to respond True to `isinstance(..., type)` again? I don't want singledispatch, or any other library like it, to have to special-case typing. Especially for *non-generic* variants, responding True to `isinstance()` seems reasonable to me. We cannot dispatch by `Sequence[int]` and some such so it makes sense for *those* to keep failing going forward.
The current suggested workaround of using abc.Sequence instead will work.
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<https://bugs.python.org/issue34498>
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