Quoth Christian Weisgerber <naddy@mips.inka.de>:
> Stefan Sperling:
> 
> > > After running cleanup on a clone of got.git, git fsck still reports
> > > a number of dangling objects.  I guess those are packed?
> > 
> > Not sure. gotadmin listpack might be able to answer this.
> 
> Yes, listpack confirms that the dangling objects are indeed contained
> in pack files.
> 

in general, you'd need to repack all objects to get rid of these.
though, you can in theory reuse the deltas for most objects and
save a bunch of time computing them when repacking.