[issue14731] Enhance Policy framework in preparation for adding email6 policies as provisional

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 9388c671d52d by R David Murray in branch 'default':
#14731: refactor email policy framework.
http://hg.python.org/cpython/rev/9388c671d52d

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nosy: +python-dev

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