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In a comment on issue 17482, Mike Bayer pointed out a backwards incompatibility resulting from changing inspect.getfullargspec (etc) to rely on inspect.signature: they now follow __wrapped__ chains, where previously they ignored them.
This means that instead of reporting the exact signature of the *wrapper*, they now report the signature of the wrapped function instead.
Since switching these functions from ignoring __wrapped__ to following it is an unintended backwards incompatible change, I'll tweak the code to bypass the unravelling of wrapper chains in the getfullargspec case.