[issue39384] Email parser creates a message object that can't be flattened as bytes.

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

If we can get an actual reproducer using message_as_bytes I'd feel more comfortable with the fix.  I worry that there is some other bug this is exposing that should be fixed instead.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39384>
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