Move $close handling in IO::Handle.comb/split
Move $close handling in IO::Handle.comb/split

To .slurp
(Also add a TODO comment for when we get Cat)

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