Re: [PATCH 2/2] repack: repack promisor objects if -a or -A is set

But what to delta against what else is determined by the pathname
info, which is now lost by enumerating objects without tree/history
walking.  By giving phoney pathnames to objects while enumerating
them in offset order and giving similar pathnames to objects closer
to each other, I was hoping that better bases will likely to be in
the same window.  The order in which objects are prepared and fed to
try_delta() is "group by type, and then sort by path-hash (major
key) and size (descending order, used as minor key)", so that
the largest among similarly named blobs is stored as base and other
blobs with similar name try to become delta against that one.

Thanks for the patient explanation - I think I see it now. If we
enumerate in pack order and pass "<sha-1> <fake-name>" instead of
"<sha-1>" to pack-objects in such a way that we make pack-objects sort
by {type -> pack-order -> size} instead of {type -> size}, we can
hopefully get better deltas. I'll write a NEEDSWORK similar to this.

I'll send a reroll later today.