That does not mean that the compressed contents will always be the
same.
At least the gzip compressed tarballs from github contain a time stamp.
That is true of the tarball-generation feature of gitweb or whatever it's
called last I looked too. It's easily fixed by having it pass -n to gzip
(which I would have thought they could have fixed in gitweb by now), and
already does not apply to bzip2 format.
Thanks,
Roland