Custom IPS repository management

HI all,

Trying to set up my own custom repository for internal/custom packages and I was just wondering if there is additional information on what happens when you publish new versions of a package to the repo.  For instance, is there any deduplication happening to reduce disk space, such as deltas of what's changed from say, version 1 to version 2?  I made a ZFS fileset for the repo as suggested by the docs, and I will turn compression on.  Is there anything else I should be aware of as I "pkgsend publish"  new versions?  My testing is going well but I need to publish some larger packages to really see how disk space is being managed.