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

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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stage:  -> patch review

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