[issue13617] Reject embedded null characters in wchar* strings

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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type:  -> behavior
versions: +Python 3.6, Python 3.7 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13617>
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