email message objects are likely
https://docs.python.org/3/library/email.message.html
in the cpython source, it looked like the serializing and
deserializing this class with bytes is partially but not fully tested
for idempotency. it appeared the deserialization tests disabled
unix_from and only deserialized using a StringIO object, not including
non-utf8 byte content. i did not review the tests to the very end.

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