R. David Murray <rdmur...@bitdance.com> added the comment:

Message/EmailMessage are intentionally mimicing the full dictionary API, not 
just the Mapping API (with a couple exceptions and several extensions).  But it 
is important to mention that it is ordered, both for the reason INADA stgtes, 
and because the text goes on to discuss the handling of duplicate headers and 
what happens when you add and delete headers.  While this turns out to be 
almost the same as the rules used by a standard python dictionary, that is 
partially a coincidence....other ordering rules could have been chosen.

----------
nosy: +r.david.murray
resolution:  -> not a bug
stage: patch review -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33819>
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