This update for rubygem-rack-1_6 fixes the following issues:
{ "binaries": [ { "ruby2.5-rubygem-rack-1_6": "1.6.8-150000.3.3.1", "ruby2.5-rubygem-rack-testsuite-1_6": "1.6.8-150000.3.3.1", "ruby2.5-rubygem-rack-doc-1_6": "1.6.8-150000.3.3.1" } ] }