Allow negative Unicode digit type constraints
Allow negative Unicode digit type constraints

Part of the fix for RT #129279
tbrowder/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,tony-o/rakudo,salortiz/rakudo,usev6/rakudo,Gnouc/rakudo,Gnouc/rakudo,softmoth/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,nbrown/rakudo,samcv/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,Gnouc/rakudo,rakudo/rakudo,jonathanstowe/rakudo,softmoth/rakudo,awwaiid/rakudo,tony-o/rakudo,sjn/rakudo,labster/rakudo,awwaiid/rakudo,raydiak/rakudo,sjn/rakudo,labster/rakudo,rakudo/rakudo,raydiak/rakudo,tbrowder/rakudo,samcv/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,tbrowder/rakudo,usev6/rakudo,tony-o/rakudo,nbrown/rakudo,rakudo/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,usev6/rakudo,salortiz/rakudo,samcv/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,salortiz/rakudo,rakudo/rakudo,usev6/rakudo,salortiz/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,softmoth/rakudo,nbrown/rakudo,salortiz/rakudo,rakudo/rakudo,samcv/rakudo,sjn/rakudo,labster/rakudo,raydiak/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,salortiz/rakudo,nbrown/rakudo,samcv/rakudo,nbrown/rakudo,lucasbuchala/rakudo,tony-o/rakudo,softmoth/rakudo,sjn/rakudo,MasterDuke17/rakudo,sjn/rakudo,labster/rakudo,tony-o/rakudo,rakudo/rakudo,softmoth/rakudo,labster/rakudo,nbrown/rakudo,MasterDuke17/rakudo,awwaiid/rakudo,labster/rakudo,jonathanstowe/rakudo,raydiak/rakudo,tony-o/rakudo,usev6/rakudo,tbrowder/rakudo