Package: libruby2.7 Version: 2.7.2-3 Severity: normal
Please consider replacing the GPL-3 licensed build dependency libreadline6-dev with libedit-dev, which is also supported by Ruby. The GPL-3 is incompatible with some licenses such as GPL-2-only. Therefore, a foundational package such as libruby2.7 should choose the more liberally licensed dependency to allow as much software in the archive as possible without license headaches.
Most probably, there is already a GPL-2-only ruby software in the archive that uses the readline module but I did not check.