After downloading a .zip file containing a .app bundle, Safari auto-extracts the .zip file (assuming the "Open safe files after downloading" preference is enabled, which it is by default) which leaves the .app ready to run in Downloads.
.zip is not a very efficient archive format. We would like to use something better, but want to maintain Safari's auto-extract behavior. I've tested several other formats but found that Safari does not extract them: .aar(Apple Archive), .tar.xz, .txz.
Is there any documentation on which formats Safari will auto-extract? Should anything other than .zip auto-extract?