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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: how to speed up Lisp devel time
Date: Fri, 09 Aug 2024 21:00:30 +0300
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> From: Emanuel Berg <incal@dataswamp.org>
> Date: Fri, 09 Aug 2024 18:19:58 +0200
> 
> (defun draw-scale (&optional end step i)
>   (interactive (if (numberp current-prefix-arg)
>                    (list current-prefix-arg)
>                  current-prefix-arg))

Using "p" doesn't prevent you from testing the value of
current-prefix-arg, if that is what you want to do.

But in general, having commands with more than one optional argument
(two when the command acts on a region) is not recommended, because it
complicates the interactive usage.