nothing to do here but running latest rails and ruby 3 preview on quite a big app. it should run fine; just some few addl requires since ruby is gemifying its standard lib (wc is good :)
best regards and happy rubying. cant wait for xmas! :))
--botp
$ bin/rails s -p 4000
=> Booting Puma
=> Rails 6.1.0 application starting in development
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 5.1.1 (ruby 3.0.0-p-1) ("At Your Service")
* Min threads: 5
* Max threads: 5
* Environment: development
* PID: 31077
* Listening on
http://127.0.0.1:4000Use Ctrl-C to stop