On Wed, Oct 30, 2013 at 03:17:45PM -0700, Junio C Hamano wrote:

Git v1.8.5 Release Notes (draft)
========================
[...]
 * A packfile that stores the same object more than once is broken and
   will be rejected by "git index-pack" that is run when receiving
   data over the wire.

We ended up scrapping the index-pack patch, in favor of just using the
existing --strict check. So the correct statement is more like '...will
be rejected by "git index-pack --strict"'. But that is not a new
behavior in v1.8.5. :)

We did fix bugs in GIT_USE_LOOKUP related to duplicates in commit
171bdac. That may not be exciting enough to mention in the release
notes, though, as the code is not even used by default.

-Peff