Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
I do not think there is a problem in MyPy. What if use __origin__ for
dispatching? Registering with parametrized generics with the same __origin__
will be error.
@sigledispatch
def f(a: int) -> None:
pass
@f.register # ok
def _(a: list[int]) -> None:
pass
@f.register # runtime error
def _(a: list[str]) -> None:
pass
@f.register # runtime error
def _(a: list) -> None:
pass
f(1) # ok
f([1]) # ok
f([]) # ok
f(['abc']) # static type checking error
I think that it will have advantage of stronger static type checking.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46191>
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