From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: [PATCH] Use prefix arg to control scope of
 org-narrow-to-subtree.
Date: Mon, 02 Dec 2019 08:51:54 +0000
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Karl Fogel <kfogel@red-bean.com> writes:

> This is the enhancement to `org-narrow-to-subtree' that I suggested back in May [1].
>
> It allows you to choose what level subtree to narrow to. There are two
> ways to specify the subtree: use repeated C-u's to select "upward"
> from the current subtree, or use a direct numeric prefix arg to
> specify the subtree "downward" from level 1. (This is a somewhat
> unusual prefix argument usage, but it's useful to be able to choose
> from either direction, and the convenience of using C-u to select
> upward is quite enormous -- I expect it to be the common case, and
> it's pretty much the only way I use the feature.)

Just 2c: you're right that's a slightly odd use of the prefix argument.
I think a slightly more conventional approach might be to use positive
and negative numerical arguments, positive going one direction, negative
the other. Just a suggestion, though -- I like this addition a lot.