Upper bound grandfathered checkers (#4441)
Upper bound grandfathered checkers (#4441)

fimad/stackage,ethercrow/stackage,soenkehahn/stackage,michalkonecny/stackage,fpco/stackage,int-index/stackage,mrkkrp/stackage,spencerjanssen/stackage,athanclark/stackage,mstksg/stackage,asr/stackage,Daniel-Diaz/stackage,clinty/stackage,simonmichael/stackage,wereHamster/stackage,stackbuilders/stackage,peti/stackage,jonschoning/stackage,massysett/stackage,iand675/stackage