Fix up .tell to respect decoder's buffer.
Fix up .tell to respect decoder's buffer.

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