Use the AtomicReference map backend on Truffle.
Use the AtomicReference map backend on Truffle.

lucasallan/concurrent-ruby,hobodave/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,MadBomber/concurrent-ruby,MadBomber/concurrent-ruby,hobodave/concurrent-ruby,MadBomber/concurrent-ruby,lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,MadBomber/concurrent-ruby