concurrent-ruby rspec testsuite fails with ruby4.0.0dev perhaps due to Set change #1093

$ env RUBYLIB=$(pwd)/lib/concurrent-ruby rspec --exclude-pattern 'spec/concurrent/{actor_spec.rb,channel_spec.rb,lazy_register_spec.rb,channel/**/*,edge/**/*,processing_actor_spec.rb,promises_spec.rb,throttle_spec.rb,cancellation_spec.rb,executor/wrapping_executor_spec.rb}'

......
Failures:

  1) Concurrent::Set.[] when initializing with arguments creates a set with the given objects
     Failure/Error: monitor or raise("BUG: Internal monitor was not properly initialized. Please report this to the concurrent-ruby developers.")
     
     RuntimeError:
       BUG: Internal monitor was not properly initialized. Please report this to the concurrent-ruby developers.
     # ./lib/concurrent-ruby/concurrent/thread_safe/util/data_structures.rb:34:in 'Concurrent::CRubySet#=='
     # ./spec/concurrent/set_spec.rb:17:in 'block (4 levels) in <module:Concurrent>'

  2) Concurrent::Set.[] when initializing with no arguments is expected to be empty
     Failure/Error: monitor or raise("BUG: Internal monitor was not properly initialized. Please report this to the concurrent-ruby developers.")
     
     RuntimeError:
       BUG: Internal monitor was not properly initialized. Please report this to the concurrent-ruby developers.
     # ./lib/concurrent-ruby/concurrent/thread_safe/util/data_structures.rb:34:in 'Concurrent::CRubySet#empty?'
     # ./spec/concurrent/set_spec.rb:11:in 'block (4 levels) in <module:Concurrent>'

Finished in 2 minutes 31.1 seconds (files took 0.48868 seconds to load)
2157 examples, 2 failures, 12 pending

Failed examples:

rspec ./spec/concurrent/set_spec.rb:16 # Concurrent::Set.[] when initializing with arguments creates a set with the given objects
rspec ./spec/concurrent/set_spec.rb:10 # Concurrent::Set.[] when initializing with no arguments is expected to be empty