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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: string_char_to_byte and string_byte_to_char micro-optimisation
Date: Sat, 15 Jun 2019 09:22:28 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwvmuikudwl.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Fri, 14 Jun 2019 16:11:47 -0400)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Fri, 14 Jun 2019 16:11:47 -0400
> 
> > I don't think that will do for this case.  Strings are used rather
> > rarely in Emacs.  We need to find a command that uses strings
> > extensively, and uses non-ASCII text in strings in particular.
> 
> ... and uses `aref` on it extensively.

Right.  And/or 'aset'.  Other candidates are 'string-match' and
'replace-match'.  All that with non-ASCII strings, of course.