Make initial/max threads introspectable.
Make initial/max threads introspectable.

As requested by segomos++.

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