Upper bound bz2 (#5149)
Upper bound bz2 (#5149)

asr/stackage,stackbuilders/stackage,athanclark/stackage,soenkehahn/stackage,Daniel-Diaz/stackage,michalkonecny/stackage,fpco/stackage,iand675/stackage,mrkkrp/stackage,massysett/stackage,simonmichael/stackage,jonschoning/stackage,clinty/stackage