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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Always-true predicate?
Date: Sun, 21 Feb 2021 17:12:34 +0200
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> From: Richard Stallman <rms@gnu.org>
> Date: Sun, 21 Feb 2021 01:12:04 -0500
> Cc: larsi@gnus.org, emacs-devel@gnu.org
> 
> In regard to user options whose values are functions,
> I think it is good to allow nil and t as values.
> That would be cleaner than setting the option to `ignore'
> or always-return-t.

In addition, any other atoms -- symbols, numbers, strings -- are
easier to type and easier for users to customize in their init files.