[issue4757] reject unicode in zlib

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> > I propose to reject unicode in Python 3.x and display a warning for
> > Python 2.x. A warning to prepare the migration... not to Unicode, but to
> > Python3 ;-)
>
> Fair enough.

The patch for Python 3.x is already attached to this issue. We might only 
apply this one and leave Python 2.x unchanged. Can someone review the patch?

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