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bug#39506: patch

From: Stefan Monnier
Subject: bug#39506: patch
Date: Sat, 08 Feb 2020 14:51:02 -0500
User-agent: 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.


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