[issue956303] Update pickle docs to describe format of persistent IDs

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

The updated documentation for pickle for Python 3 describes the
requirement that persistent IDs should be alphanumeric strings when
protocol 0 is used.

http://docs.python.org/3.0/library/pickle.html#persistence-of-external-objects

Closing as fixed.

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resolution:  -> fixed
status: open -> closed

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