Bug: CallableView on builtins/enums

[DanCardin]

Description

Many native builtins implemented in C do not have native signatures. Thus when we call inspect.signature is yields a ValueError. Seems like these cases e.g. boolshould probably be falling back to inspectingfn.call`

enum.Enum implementations raise AttributeError because cls.__signature__ is pre-populated with a callable method who's purpose eludes me but apparently inspect.signature gained support for dealing with at some point, because there was a bug report about it.

We could do something to the effect of

        signature = getattr(fn, "__signature__", None)
        if signature is None or inspect.ismethod(signature):
            self.signature = inspect.signature(fn)
        else:
            self.signature = signature

because i think this case is actually just a weird enum-specific nonsense special case.

URL to code causing the issue

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MCVE

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Steps to reproduce

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2. Click on '....'
3. Scroll down to '....'
4. See error

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Package Version

latest

Platform

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