They are a little annoying because they are a tar file of tar.gz files. It isn't just about adding ".gem" as a tar map, we need to recurse into the .tar.gz files it contains :(
tar -ztvf cocoapods_fixbugs-plugin-0.1.0.gem
-r--r--r-- 0 wheel wheel 670 Feb 20 2020 metadata.gz
-r--r--r-- 0 wheel wheel 3659427 Feb 20 2020 data.tar.gz
-r--r--r-- 0 wheel wheel 296 Feb 20 2020 checksums.yaml.gz
They are a little annoying because they are a tar file of tar.gz files. It isn't just about adding ".gem" as a tar map, we need to recurse into the .tar.gz files it contains :(