Re: master daea9b3 1/2: Read mailcaps again only when necessary

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Eli Zaretskii <eliz@gnu.org>,  gregory@heytings.org,  emacs-devel@gnu.org
> Date: Mon, 01 Nov 2021 14:20:41 -0400
> 
> Lars Ingebrigtsen [2021-11-01 18:29:12] wrote:
> > Eli Zaretskii <eliz@gnu.org> writes:
> >> What if we have the same file name in several different directories --
> >> how will you record the files so they all get different hash slots?
> > Oh, you mean relative file names?  I think it's up to the caller to
> > decide.  If they don't want that, then give an absolute file name, and
> > if they do want that, then don't.
> 
> To avoid disappointment, it makes sense to pass the filename through
> `expand-file-name` or to signal an error if the file name is not
> absolute.

Why signal an error when the function can make the file name absolute
so easily?  It makes no sense.  No other API that accepts file names
does that, AFAIK.