Jeff King [off-list ref] writes:
I am much more concerned with whether and how this information would be
represented in the "git status --porcelain" format.
I earlier suggested using 'I'; a safer alternative would be to change
nothing and let the callers figure it out. I slightly favor the former;
while there is a definite risk of breaking scripts' expectations, they can
be tentatively marked "this script does not work until you 'git add' paths
you used 'add -N'" and I don't think it would be such a big deal.