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Sat, 08 Feb 2020 14:51:02 -0500
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)
>> - Before deciding whether unibyte or multibyte is the right choice, the
>> main question is whether the buffer contains bytes or chars.
> My buffer contained some Chinese multibytes.
That suggests it contains characters rather than bytes. How did
that happen? Where does this buffer ('s contents) come from?
> You can see my unit test in the patch.
In your unit test, you artificially create a multibyte buffer with
chinese chars, so that doesn't answer my question ;-)
AFAIK `mm-with-part` is designed for MIME parts and MIME parts can only
contain bytes at that point. Only after we extract them as bytes and
apply `mm-decode-content-transfer-encoding` to it can we consider
decoding those bytes into chars.
So I suspect that the source of your problem is earlier, where some code
incorrectly decodes some content too early. Hence the need to better
understand where those chinese chars come from.