Fix failure to smartmatch Numeric:U against Numeric:D
Fix failure to smartmatch Numeric:U against Numeric:D

The candidate is too wide and when Numeric:U is given, throwage occurs
when it's used with the `==` operator inside the method's body.

Restrict the candidate to :D types only and let Any's candidates take
care of the :U types.

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