falcon serve on blank rails app with ruby 3.0.0 fails

[scally]

/Users/sean/.rvm/gems/ruby-3.0.0/gems/railties-6.1.1/lib/rails/initializable.rb:60 in `run_initializers'
/Users/sean/.rvm/gems/ruby-3.0.0rve.rb:60 in `load_app'
 /Users/sean/.rvm/gems/ruby-3.0.0/gems/falcon-0.37.2/lib/falcon/controller/serve.rb:89 in `block (2 levels) in setup'
/Users/sean/.rvm/gems/ruby-3.0.0/gems/async-1.28.3/lib/async/task.rb:265 in `block in make_fiber'
Caused by TypeError: nil can't be coerced into Float
→ /Users/sean/.rvm/gems/ruby-3.0.0/gems/timers-4.3.2/lib/timers/timer.rb:103 in `+'

A blank app will boot with ruby 3.0 and rails 6.1 using rails s. Removing puma and adding falcon to the gem file and then running falcon serve results in this error.

[the-spectator]

I can reproduce the issue on my system. I tracked the error in the listen gem, method wait_for_state is passing timeout as nil, due to incorrect passing of arguments.

Relevant Code: https://github.com/guard/listen/blob/f0572f7bbca48fb832d4ada5a61d729db0d20a88/lib/listen/event/loop.rb#L55-L59

System configuration

ruby version: 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux]
rails: 6.1.1
falcon: 0.37.2
async: 1.28.3
listen: 3.4.0

[the-spectator]

I have created guard/listen#529 to resolve this issue on listen master.

[scally]

confirmed, bumping to latest listen solves this problem