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

[Yury Selivanov]

Yury Selivanov added the comment:

Second patch attached: sig_builtincls_02.patch, with a fix, that Nick suggested. Larry, I'd like you to take a quick look at it as well, before I commit it.

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