Eli Zaretskii <eliz@gnu.org> writes:

>> From: João Távora <joaotavora@gmail.com>
>> Date: Wed, 12 Apr 2023 18:14:28 +0100
>> Cc: "Philip K." <philipk@posteo.net>, Stefan Monnier
>> <monnier@iro.umontreal.ca>, 62720@debbugs.gnu.org,
>> 	Lars Ingebrigtsen <larsi@gnus.org>
>> 
>> Please, in normal non-shouting case, explain to me how you think
>> that the behavior of an existing
>> command can be changed with "completely separate code". 
>
> I already did: either (1) add a prefix argument to an existing
> command, which will then trigger the new behavior, or (2) add a
> separate command.

Here you have (1):