[docs] [issue17576] PyNumber_Index() is not int-subclass friendly (or operator.index() docos lie)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is updated patch. There is no more overhead in PyLong_As* functions. Simplified PyNumber_Index(). assertWarns() now used instead of support.check_warnings(). Added new tests.

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Added file: http://bugs.python.org/file33077/issue17576_v3.patch

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