[issue20015] Allow 1-character ASCII unicode where 1-character str is required

[STINNER Victor]

STINNER Victor added the comment:

I don't like the heuristic of "ASCII only" characters. Accepting that may lead to bugs if later you pass a non-ASCII character.

And is it not too late to change that in Python 2.7? Version released 3 years ago and widely used in production.

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nosy: +haypo

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<http://bugs.python.org/issue20015>
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