[issue21401] python2 -3 does not warn about str/unicode to bytes conversions and comparisons

[Brett Cannon]

Brett Cannon added the comment:

I thought we gave ourselves the wiggle room to change the warnings we emitted for -3 (I unfortunately can't find a reference to something relating to that in the Python 2.7 PEP)?

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<http://bugs.python.org/issue21401>
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