Eli Zaretskii <eliz@gnu.org> writes:

>> From: Philip Kaludercic <philipk@posteo.net>
>> Cc: João Távora <joaotavora@gmail.com>,
>>   monnier@iro.umontreal.ca,
>>   62720@debbugs.gnu.org,  larsi@gnus.org
>> Date: Wed, 12 Apr 2023 19:39:20 +0000
>> 
>> >> 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):
>
> Thanks.  This is almost on-target, but it modifies
> package-compute-transaction.  Is that necessary?

I have found an alternative that doesn't change the way
`package-compute-transaction' works, but requires a small change in
`package-install':