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Re: compute ISBN-10, char-to-int?

From: Eli Zaretskii
Subject: Re: compute ISBN-10, char-to-int?
Date: Sat, 07 Sep 2019 20:20:37 +0300

> From: Stefan Monnier <>
> Date: Sat, 07 Sep 2019 13:13:45 -0400
> I think the main threat could come from a charset where digits appear
> multiple times (e.g. some kind of iso-2022 system where some of the
> sub-charsets also include digits), in which case (+ n ?0) would still
> work but (- c ?0) could occasionally fail.  But, I don't know of such
> a charset either.

All true, but not really relevant to the issue at hand, because in
Emacs characters are always Unicode codepoints.

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