[issue4738] Patch to make zlib-objects better support threads

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> May I also suggest to change the zlib module not to accept s* but y*

You are probably right, but this would also break the API and can't be
done lightheartedly. You can open a new bug entry about this though.

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<http://bugs.python.org/issue4738>
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