xiota [1] filed a deletion request for kde-rounded-corners [2]: This is an incorrectly named and implemented `-git` package. As such, it is a duplicate of `kwin-effect-rounded-corners-git`. Maintainer was notified of the issue via comment over three months ago, but has not responded.
[1] https://aur.archlinux.org/account/xiota/ [2] https://aur.archlinux.org/pkgbase/kde-rounded-corners/
