Add :keytype and :of named parameters to classify / categorize
Add :keytype and :of named parameters to classify / categorize

So that we can return non-string values from test block if necessary.  This
is unspecced.  If this feels right for TimToady / pmichaud, it should be
specced.  If this doesn't feel right, then I'll revert this patch.

tony-o/deb-rakudodaily,Leont/rakudo,zostay/rakudo,zostay/rakudo,tony-o/deb-rakudodaily,zhuomingliang/rakudo,sergot/rakudo,MasterDuke17/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,laben/rakudo,teodozjan/rakudo,ugexe/rakudo,jonathanstowe/rakudo,azawawi/rakudo,tbrowder/rakudo,dankogai/rakudo,paultcochrane/rakudo,raydiak/rakudo,niner/rakudo,retupmoca/rakudo,nunorc/rakudo,cygx/rakudo,lucasbuchala/rakudo,rakudo/rakudo,dankogai/rakudo,salortiz/rakudo,softmoth/rakudo,tony-o/rakudo,LLFourn/rakudo,b2gills/rakudo,sergot/rakudo,pmurias/rakudo,softmoth/rakudo,nbrown/rakudo,teodozjan/rakudo,niner/rakudo,niner/rakudo,rakudo/rakudo,cognominal/rakudo,skids/rakudo,rakudo/rakudo,labster/rakudo,tbrowder/rakudo,tony-o/deb-rakudodaily,retupmoca/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,LLFourn/rakudo,MasterDuke17/rakudo,b2gills/rakudo,dwarring/rakudo,sjn/rakudo,dwarring/rakudo,dwarring/rakudo,lucasbuchala/rakudo,tony-o/deb-rakudodaily,lucasbuchala/rakudo,MasterDuke17/rakudo,dankogai/rakudo,Gnouc/rakudo,laben/rakudo,Gnouc/rakudo,salortiz/rakudo,samcv/rakudo,tony-o/deb-rakudodaily,cygx/rakudo,b2gills/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,usev6/rakudo,ungrim97/rakudo,MasterDuke17/rakudo,tony-o/rakudo,labster/rakudo,tony-o/deb-rakudodaily,paultcochrane/rakudo,b2gills/rakudo,ungrim97/rakudo,usev6/rakudo,usev6/rakudo,softmoth/rakudo,ungrim97/rakudo,tbrowder/rakudo,Gnouc/rakudo,labster/rakudo,nbrown/rakudo,sergot/rakudo,ugexe/rakudo,tony-o/rakudo,labster/rakudo,nbrown/rakudo,ungrim97/rakudo,awwaiid/rakudo,rakudo/rakudo,zostay/rakudo,zhuomingliang/rakudo,sjn/rakudo,samcv/rakudo,paultcochrane/rakudo,samcv/rakudo,cognominal/rakudo,skids/rakudo,Gnouc/rakudo,skids/rakudo,ugexe/rakudo,sjn/rakudo,jonathanstowe/rakudo,dwarring/rakudo,raydiak/rakudo,tony-o/deb-rakudodaily,laben/rakudo,teodozjan/rakudo,azawawi/rakudo,niner/rakudo,usev6/rakudo,ungrim97/rakudo,nunorc/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,raydiak/rakudo,tony-o/rakudo,zhuomingliang/rakudo,sjn/rakudo,cognominal/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,raydiak/rakudo,salortiz/rakudo,cognominal/rakudo,zostay/rakudo,azawawi/rakudo,usev6/rakudo,Leont/rakudo,rakudo/rakudo,sjn/rakudo,pmurias/rakudo,ugexe/rakudo,paultcochrane/rakudo,azawawi/rakudo,ab5tract/rakudo,softmoth/rakudo,salortiz/rakudo,awwaiid/rakudo,Gnouc/rakudo,nunorc/rakudo,dankogai/rakudo,zhuomingliang/rakudo,Leont/rakudo,cygx/rakudo,skids/rakudo,retupmoca/rakudo,azawawi/rakudo,samcv/rakudo,salortiz/rakudo,ab5tract/rakudo,cygx/rakudo,LLFourn/rakudo,Gnouc/rakudo,dankogai/rakudo,samcv/rakudo,laben/rakudo,b2gills/rakudo,retupmoca/rakudo,teodozjan/rakudo,Leont/rakudo,tony-o/rakudo,sergot/rakudo,nunorc/rakudo,pmurias/rakudo,softmoth/rakudo,ugexe/rakudo,LLFourn/rakudo,tbrowder/rakudo,cognominal/rakudo,cygx/rakudo,pmurias/rakudo,salortiz/rakudo,rakudo/rakudo,nbrown/rakudo,labster/rakudo,paultcochrane/rakudo,nbrown/rakudo,LLFourn/rakudo,labster/rakudo,ab5tract/rakudo,lucasbuchala/rakudo,ab5tract/rakudo,nbrown/rakudo,awwaiid/rakudo,tony-o/rakudo,skids/rakudo