MarsSeed [1] filed a request to merge mono-nightly [2] into mono-git [3]: 'mono-nightly' is defunct, unmaintained since 2022-03-07. Its former owner orphaned it. It has no comments, and only 1 AUR vote.
It makes sense to keep only the '-git' package, as that is practically quite the same as if the nightly package was version-bumped every day. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/mono-nightly/ [3] https://aur.archlinux.org/pkgbase/mono-git/
