[issue28822] Fix indices handling in PyUnicode_FindChar

[Xiang Zhang]

Xiang Zhang added the comment:

> Remaining question: what is the behaviour for direction=0, direction=100 or direction=-2? Maybe we can add a few unit tests for strange values of direction? (Not sure if it's worth it.)

It's not documented so I also doubt it. Expect Serhiy's comment.

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<http://bugs.python.org/issue28822>
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