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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> The ssize_t functions deliberately ignore lossy int conversions (e.g. from
> floats) - that's why they only work on types that implement __index__.

They ignore __index__.

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<http://bugs.python.org/issue17576>
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