[issue5670] Speed up pickling of dicts in cPickle

[Antoine Pitrou]

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

Without taking a very detailed look, the patch looks good.
Are there already tests for pickling of dict subclasses? Otherwise, they
should be added.

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nosy: +pitrou

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<http://bugs.python.org/issue5670>
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