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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Making `eglot-server-programs' a custom variable?
Date: Thu, 10 Nov 2022 18:50:23 +0200
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In-Reply-To: <d6eec547-98de-0560-3c04-d48c8cb3d3c7@yandex.ru> (message from
 Dmitry Gutov on Thu, 10 Nov 2022 17:35:55 +0200)
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> Date: Thu, 10 Nov 2022 17:35:55 +0200
> Cc: arash@gnu.org, theophilusx@gmail.com, emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> If you just have a command (to be used interactively, right?), it will 
> only affect the value in the current session.

The command could do whatever we want it to do, including writing to
the user's init file, if the user wants that.  And if the command is
invoked from the init file, it will affect the current session, in
every session.

> defcustom provides a facility to persist the changes between sessions.

So do commands.