Abstract Mix (<=) Mix logic into R:Q.MIX-IS-SUBSET
Abstract Mix (<=) Mix logic into R:Q.MIX-IS-SUBSET

Since all Baggy's share the same internal structure, we can
actually use this logic for Bag(|Hash) (<=) Mix(|Hash) and
Mix(|Hash) (<=) Bag(|Hash) as well.

salortiz/rakudo,softmoth/rakudo,tony-o/rakudo,tbrowder/rakudo,raydiak/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,awwaiid/rakudo,sjn/rakudo,tony-o/rakudo,softmoth/rakudo,usev6/rakudo,jonathanstowe/rakudo,labster/rakudo,rakudo/rakudo,labster/rakudo,sjn/rakudo,labster/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,salortiz/rakudo,lucasbuchala/rakudo,nbrown/rakudo,raydiak/rakudo,Gnouc/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,tony-o/rakudo,tony-o/rakudo,MasterDuke17/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,salortiz/rakudo,rakudo/rakudo,raydiak/rakudo,tbrowder/rakudo,softmoth/rakudo,MasterDuke17/rakudo,labster/rakudo,raydiak/rakudo,MasterDuke17/rakudo,nbrown/rakudo,sjn/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,lucasbuchala/rakudo,salortiz/rakudo,sjn/rakudo,Gnouc/rakudo,usev6/rakudo,Gnouc/rakudo,rakudo/rakudo,tony-o/rakudo,rakudo/rakudo,rakudo/rakudo,usev6/rakudo,awwaiid/rakudo,usev6/rakudo,tony-o/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,tbrowder/rakudo,labster/rakudo,salortiz/rakudo,tbrowder/rakudo,usev6/rakudo,jonathanstowe/rakudo,softmoth/rakudo,jonathanstowe/rakudo,nbrown/rakudo,softmoth/rakudo,MasterDuke17/rakudo,nbrown/rakudo,nbrown/rakudo,rakudo/rakudo,labster/rakudo,awwaiid/rakudo,nbrown/rakudo,salortiz/rakudo,sjn/rakudo,lucasbuchala/rakudo