[issue17481] inspect.getfullargspec should use __signature__

[Yury Selivanov]

Yury Selivanov added the comment:

> Otherwise we run the risk of introducing unexpected exceptions into introspection code.

That's a good catch. I'll make a new patch, keeping the old implementation of getfullargsspec intact, and falling back to it if no signature can be found.

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<http://bugs.python.org/issue17481>
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