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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Is it ok to sort a list of overlays destructively?
Date: Thu, 29 Jul 2021 18:30:49 +0300
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> Date: Thu, 29 Jul 2021 08:11:46 -0700
> From: 2QdxY4RzWzUUiLuE@potatochowder.com
> 
> > > I am not sure if such a statement exists in any of the manuals. Should
> > > it not be stated explicitly somewhere?
> > 
> > I don't think it should be, no.  It's pretty much obvious, IMO.
> 
> I'm not disagreeing, but why is it obvious?

Because anything else is a bug, for the same reason that you
rightfully expect Emacs not to crash when some Lisp program does
something silly.