• Merged in the thread_safe gem
  • Concurrent::Array
  • Concurrent::Hash
  • Concurrent::Map (formerly ThreadSafe::Cache)
  • Concurrent::Tuple
• Minor improvements to Concurrent::Map
• Complete rewrite of Exchanger
• Removed all deprecated code (classes, methods, constants, etc.)
• Updated Agent, MutexAtomic, and BufferedChannel to inherit from Synchronization::Object.
• Many improved tests
• Some internal reorganization