New Features in Ruby 2.1.0
What's new in Ruby 2.1.0: Under the Hood
What's new in Ruby 2.1.0? There are two new features under the hood that you may not know about: Method caching and an enhanced garbage colllector.
What's new in Ruby 2.1.0: Numerics
Ruby 2.1.0 includes a new small changes to numeric literals if you're working with rational or imaginary numbers, as well as a few changes to how Bignum works under the hood.