Revert Enum:D ACCEPTSing Enum:U
Revert Enum:D ACCEPTSing Enum:U

That's what elements of an enumeration really are, the :D's and
the enumeration itself is a :U. For :D's to be accepting :U's
it makes as little sence as an Int:D constraint accepting an `Int`

This is part of fixing https://github.com/rakudo/rakudo/issues/2073
A more complete fix might involve banning the use of Enum:D's in
the same place as other types and instead requiring the use of
`where` clauses for such use.

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