Great thank you.
The packages are adopted and updated. Now everyone can enjoy ruby-4.0.2 from AUR. I tested it on a few simple rails apps and everything seems fine.
An additional cleanup requests:
Please merge old "bundle" rails into the correct one https://aur.archlinux.org/packages/ruby-rails-aio/ https://aur.archlinux.org/packages/rails/ into https://aur.archlinux.org/packages/ruby-rails/
The bundle packages install several *.gem files at once. The correct way is to to have one package-per-gem.
Merge https://aur.archlinux.org/packages/ruby-rmagick2/ into https://aur.archlinux.org/packages/ruby-rmagick/
these are duplicated packages
Merge https://aur.archlinux.org/packages/sqlite3-ruby/ into https://aur.archlinux.org/packages/ruby-sqlite3/
These are duplicated packages. sqlite3-ruby actually belongs to 'kidoz' but he is inactive.
Merge https://aur.archlinux.org/packages/ruby-protocol-buffers/ into https://aur.archlinux.org/packages/ruby-ruby-protocol-buffers/
Although ruby-ruby-protocol-buffers is uglier package name it is the correct one (the gem name is ruby-protocol-buffers)