[issue27867] various issues due to misuse of PySlice_GetIndicesEx

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Renamed _PySlice_EvalIndices() to _PySlice_AdjustIndices() and changed its signature. Updated the documentation and python3.def. Fixed yet one bug: implementation-defined behavior with division by negative step.

Note that since new functions are used in public macro, they become a part of the stable API. Shouldn't starting underscores be removed from names?

An attempt of discussing names and signatures on Python-Dev: https://mail.python.org/pipermail/python-dev/2016-December/147048.html.

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Added file: http://bugs.python.org/file46085/slice_get_indices_2.patch

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