Fix test breakage caused by 48cc6b5f469e915333
Fix test breakage caused by 48cc6b5f469e915333

Implements:
- Channel.receive-nil-on-close
- Channel.iterator
- Channel.Seq
Re-Implements:
- Channel.list

Also: RT #127968 was a dup of RT #127960

usev6/rakudo,raydiak/rakudo,awwaiid/rakudo,sjn/rakudo,jonathanstowe/rakudo,sjn/rakudo,rakudo/rakudo,samcv/rakudo,b2gills/rakudo,MasterDuke17/rakudo,b2gills/rakudo,salortiz/rakudo,MasterDuke17/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,softmoth/rakudo,samcv/rakudo,salortiz/rakudo,tony-o/rakudo,tbrowder/rakudo,softmoth/rakudo,labster/rakudo,tbrowder/rakudo,tony-o/rakudo,labster/rakudo,awwaiid/rakudo,tony-o/rakudo,rakudo/rakudo,rakudo/rakudo,jonathanstowe/rakudo,jonathanstowe/rakudo,nbrown/rakudo,tbrowder/rakudo,raydiak/rakudo,nbrown/rakudo,lucasbuchala/rakudo,sjn/rakudo,labster/rakudo,awwaiid/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,salortiz/rakudo,samcv/rakudo,softmoth/rakudo,usev6/rakudo,labster/rakudo,nbrown/rakudo,Gnouc/rakudo,labster/rakudo,Gnouc/rakudo,salortiz/rakudo,rakudo/rakudo,tony-o/rakudo,sjn/rakudo,tony-o/rakudo,usev6/rakudo,tbrowder/rakudo,usev6/rakudo,softmoth/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,nbrown/rakudo,samcv/rakudo,zostay/rakudo,sjn/rakudo,rakudo/rakudo,tony-o/rakudo,salortiz/rakudo,rakudo/rakudo,Gnouc/rakudo,b2gills/rakudo,Gnouc/rakudo,nbrown/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,raydiak/rakudo,Gnouc/rakudo,b2gills/rakudo,usev6/rakudo,samcv/rakudo,b2gills/rakudo,salortiz/rakudo,tbrowder/rakudo,tbrowder/rakudo,awwaiid/rakudo,softmoth/rakudo,nbrown/rakudo,lucasbuchala/rakudo,zostay/rakudo,zostay/rakudo,raydiak/rakudo,labster/rakudo,zostay/rakudo