Patch release
- Trigger execution of flattened delayed futures
- Avoid forking for processor_count if possible
- Semaphore Mutex and JRuby parity
- Adds Map#each as alias to Map#each_pair
- Fix uninitialized instance variables
- Make Fixnum, Bignum merger ready
- Allows Promise#then to receive an executor
- TimerSet now survives a fork
- Reject promise on any exception
- Allow ThreadLocalVar to be initialized with a block
- Support Alpha with
Concurrent::processor_count - Fixes format-security error when compiling ruby_193_compatible.h
- Concurrent::Atom#swap fixed: reraise the exceptions from block