Re: master 49e243c0c85: Avoid resizing mutation in subst-char-in-string, take two

["Mattias Engdegård" <mattias.engdegard@gmail.com>]

15 maj 2024 kl. 20.15 skrev Eli Zaretskii <eliz@gnu.org>:

>> It is very rare to see replacement exclusively confined to single block, except for block 0 (ASCII). Scripts, even Latin, generally transcend blocks and even planes. 
> 
> "Rare" is in the eye of the beholder.  Imagine processing of Arabic or
> Greek or Cyrillic text -- these replacements are natural there.

That can very well be the case, but I haven't found any examples. Maybe you are right and it would not be an unnatural thing to do, but then string mutation itself is just uncommon and is definitely becoming more so.

Anyway, the little mutation I did find wasn't confined to any particular non-Latin scripts or Unicode blocks.

>> The usefulness of equal-length multibyte `aset` is very small,
> 
> I guess we'll have to agree to disagree about this.

Certainly.

> So I think these last aspects are not really relevant to the issue at
> hand.

That is true, it doesn't inform our decisions in this matter. Other than perhaps tell us that we shouldn't be surprised if we don't find much code that tries to replace one grapheme cluster (or emoji) with another using `aset`, but that's admittedly not a very big help.