Streamline Hash[Any,Any].keys|value|kv|pairs|antipairs
Streamline Hash[Any,Any].keys|value|kv|pairs|antipairs

- the MappyIterator role already handles uninited / empty hashes
  so no need to check for definedness here as well
- rewrite pull-one's in nqp::ops
  which should specifically help .kv
- this now returns Seq for uninited / empty hashes (before: List)
  as it should have from the beginning

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