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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

And yet one nitpick. For int subclasses which doesn't overload the __int__ method the patch calls default int.__int__ which creates a copy of int object. This is redundant in PyLong_As* functions because they only extract C int value and drop Python int object. So we can use int subclass object itself as good as int object.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17576>
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