Be consistent in use of self in Str.Numeric
Be consistent in use of self in Str.Numeric

This appears to have the tiniest bit of improved performance.

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