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> Also, it is worth noting, that Signature API does not provide 100%
of functionality that deprecated APIs have. It is important to do
a soft deprecation of outdated APIs in 3.5 to gather users feedback,
and improve Signature object.
Well, here is a feedback about lost functionality. inspect.getcallargs had a very nice property that it automatically bound the first argument to the instance of bound methods. It seems I have no general way to do it with Signature.bind. Of course I can put
 arguments['self'] = method.__self__
afterwards, but theoretically, the argument doesn't have to be called 'self'. And anyway, I would like something that works seamlessly with bound methods and ordinary functions.