[issue5084] unpickling does not intern attribute names

[Jake McGuire]

Jake McGuire <jake at youtube.com> added the comment:

The fromstring/asstring dance was due to my incomplete understanding of 
refcounting.  PyDict_Next returns a borrowed reference but 
PyString_InternInPlace expects an owned reference.  Thanks to Kirk 
McDonald, I have a new patch that does the refcounting correctly.

What sort of test did you have in mind?

Added file: http://bugs.python.org/file13169/cPickle.c.diff

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