Add support for :i :m to sub indices
Add support for :i :m to sub indices

Also, by not just taking the capture, make it about 3x as fast.

rakudo/rakudo,rakudo/rakudo,tony-o/rakudo,tbrowder/rakudo,softmoth/rakudo,softmoth/rakudo,tony-o/rakudo,nbrown/rakudo,softmoth/rakudo,tbrowder/rakudo,labster/rakudo,tony-o/rakudo,softmoth/rakudo,nbrown/rakudo,labster/rakudo,salortiz/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,salortiz/rakudo,labster/rakudo,labster/rakudo,MasterDuke17/rakudo,labster/rakudo,MasterDuke17/rakudo,salortiz/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,nbrown/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,rakudo/rakudo,salortiz/rakudo,tony-o/rakudo,nbrown/rakudo,labster/rakudo,tony-o/rakudo,tbrowder/rakudo,nbrown/rakudo,nbrown/rakudo,rakudo/rakudo,rakudo/rakudo,salortiz/rakudo,tony-o/rakudo,tbrowder/rakudo,softmoth/rakudo,salortiz/rakudo