[issue23086] Add start and stop parameters to the Sequence.index() ABC mixin method

[Devin Jeanpierre]

Devin Jeanpierre added the comment:

I modified your test case somewhat. Also, your tests uncovered an issue with negative indexes -- oops, hadn't thought of those. Fixed. Let me know what you think.

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Added file: http://bugs.python.org/file37631/issue23086.2.patch

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