You can clone with
HTTPS or Subversion.
Parrot's default MRO is C3, which applies to both Perl6 and Python (>2.3). Unfortunately, it does not apply to Ruby. So, we have to do it ourselves. Apparently Rakudo still does their own (?), so we can look there for inspiration.
Ruby's MRO can be understood thusly:
Probably best to do this after #33.