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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Unbalanced change hooks (part 2)
Date: Tue, 30 Aug 2016 19:08:50 +0300
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> From: phillip.lord@russet.org.uk (Phillip Lord)
> Date: Tue, 30 Aug 2016 15:34:19 +0100
> Cc: emacs-devel@gnu.org
> 
> So, this works because subst-char-in-region is guaranteed not to change
> the size of the region right?

Caution: in characters, but not necessarily in bytes!