Multiple (single) values are a thing now, so:

is-deeply [ $g.run( q{(values 3 2 1)} ) ], [ 3, 2, 1 ];
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now DTRT. (Multiple return values in Scheme are kind of like a function returning a list of values rather than an arrayref, and that's exactly how the Perl 6 side is implemented.) After a nap at the hotel (FOSDEM upcoming) I'll get lists working, then it's on to the more fun types. Both Perl 6 and Scheme implement complex types in core, so.... Mandelscheme or Perlbrot, anyone?