Stop checking the ContainerDesciptor rw flag
Stop checking the ContainerDesciptor rw flag

The assignment logic now also simply uses the absence of the
descriptor to mean it is writable.

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