[issue20473] inspect.Signature no longer handles builtin classes correctly

[Yury Selivanov]

Yury Selivanov added the comment:

And also, reading Stefan in another issue, I'm a bit worried that
it may forcibly become a public API. Users tend to start using APIs 
before they are public, and that's especially true for python dunder 
attributes.

Maybe we should document '__text_signature__' and 'sig=', and 
explicitly state that it's a part of CPython private API, that likely 
to have some semantics/syntax changed in 3.5?

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<http://bugs.python.org/issue20473>
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