> From: Spencer Baugh <sbaugh@janestreet.com>
> Date: Thu, 4 Sep 2025 11:45:12 -0400
> Cc: mail@daniel-mendler.de, 79380@debbugs.gnu.org
>
>  Shouldn't the tests of the value of the user option use stringp
>  instead of null?
>
> Is that the convention?  I always feel like it's better to test for null explicitly, so that if the user sets the
> variable to a symbol or list or something they get an error which can help them track down their mistake.

I don't think this is about conventions.  In this specific case, any
value that is not a string will signal an error in
elisp-flymake-byte-compile--executable, exactly like nil did in the
patch that was installed.  So I think any value that is not a string
should be handled as nil (in addition to the checking of strings that
the code already does).