[issue11700] mailbox.py proxy updates

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Ah.  Well, since the io module and its classes didn't exist when that code in mailbox.py was written, no, that's not what happened :)

Nor does 'file like object' in Python necessarily mean conformance to the io specification.  We are *tending* in that direction, but the actual expected method set is really considerably smaller (and I'm not sure it is documented anywhere).

I will incorporate your suggestion into the patch, thanks.  Ezio also pointed out that I should be checking for the 'closed' method's existence before calling it, so I will add that as well.

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