[issue10839] email module should not allow some header field repetitions

[Roundup Robot]

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

New changeset d7881a371c41 by R David Murray in branch 'default':
#10839: raise an error on add of duplicate unique headers in new email policies
http://hg.python.org/cpython/rev/d7881a371c41

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nosy: +python-dev

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