Derrick Stolee [off-list ref] writes:
tl,dr: the incremental-repack isn't the most space-efficient
thing we can do, and that's by design.
I am not very surprised by the fact that many packfiles that were
obtained by thin pack transfer have many duplicate objects (due to
having to include the delta bases), and it is natural to expect that
deduplication would save many bytes. It's not all that interesting.
I am more interested in making sure that we can assure that in the
combined single pack, (1) objects are ordered for good locality of
access and (2) objects are getting good delta compression.