[issue7349] StringIO.StringIO, io.BytesIO, and io.StringIO accept None in places where other file-like objects don't

[Philip Jenvey]

Philip Jenvey <pjenvey at underboss.org> added the comment:

The original pure-python impl. of io accepted None, and still does. This 
is a regression in C impl.

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nosy: +pjenvey

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7349>
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