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

June 2, 2019

      Raymond Hettinger <raymond.hettinger@gmail.com> added the comment:

Can we at least switch to PyLong_CheckExact?  That would fix Barry's original issue and should run slightly faster.

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nosy: +rhettinger

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