[issue10180] File objects should not pickleable

[Antoine Pitrou]

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

> The patch modifies _io.TextIOWrapper, but not _pyio.TextIOWrapper. Is
> there a reason?

Yes, two of them:
- modifying _pyio.Buffered* is enough to trigger the TypeError
- _pyio.StringIO inherits from TextIOWrapper, and it must be pickleable

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<http://bugs.python.org/issue10180>
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