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bug#44486: 27.1; C-@ chars corrupt elisp buffer

From: Stefan Monnier
Subject: bug#44486: 27.1; C-@ chars corrupt elisp buffer
Date: Sat, 14 Nov 2020 10:19:57 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

>> Actually, for prefer-utf-8 files, I think we never want to automatically
>> fallback to binary.
> I think you are assuming prefer-utf-8 is something other than what it
> is.  It is not a variant of UTF-8, it is a variant of 'undecided'
> (i.e. it starts by detecting the encoding), which prefers UTF-8 if
> that can decode the text.

My position is not based on principles but on pragmatic concerns.
AFAIK `prefer-utf-8` is only ever used for files which are known to
contain text and should almost always contain UTF-8 text.

I believe if there's a NUL byte in such a files but it otherwise doesn't
contain any invalid UTF-8 byte sequence, it will result in better
behavior if we treat it as UFT-8 than as binary.


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