Hi!

The debian.rb library only supports deb binary packages with gzip
compressed data.tar members, and lacks support for all the rest, as
documented in deb(5):

  data.tar
  data.tar.xz
  data.tar.bz2
  data.tar.lzma (deprecated)

The lzma member is deprecated but might be found in the wild so it
would be a good idea to supprt reading from it. Adding support for the
rest seems important as there's an increasing number of some of those.

Thanks,
Guillem