'cast' is missing overload for type 'builtins.object'

[septatrix]

cast also accept arguments like Optional[int] and Union[str, bytes] which are not of type Type but instead are of type builtins.object. Such an overload however is missing from the typeshed which only lists overloads for Type and str

[septatrix]

Mypy currently does not generate warnings for such usage of cast as it handles it in a way which apparently also seems to suppress this error. Manually creating a new method with the same signature as is currently provided for cast however leads to errors from mypy when using such a method in the same places as cast.

[hauntsaninja]

See also: python/mypy#9773

[septatrix]

Thanks for pointing me towards that issue. The example given there is also how I stumbled upon this bug (implementing a cast-like function). Even if that proposal leads to something the signature for cast should be adjusted for current versions.

[srittau]

True, cast should probably get another overload to handle these cases. PR welcome as always.