- debdiff won't find any differences in the deb packages anymore (by using faketime with debchange and debuild and by using --rootcmd command for debuild) but not yet fully deterministic (probably due to https://wiki.debian.org/ReproducibleBuilds#Non-problems "Note that this retians *one* timestamp, which is the timestamp of the 'ar' container of the *.deb. To erase that, somehow regenerate the package within the fakeroot-faketime environment by using dpkg-deb to unpack it, then dpkg-deb to repack it.")
- creating reproducible debian upstream tarball (by using faketime and gzip -n)