1 Ruby 2.1 is the next significant version of Ruby, having been released on Christmas Day 2013, just 10 months after 2.0.0.
2 However it wasn’t terribly effective, required a lot of code scattered all over Ruby, and was almost never used, so it has been removed.
3 Most generational garbage collectors need these write barriers on all objects, but with the many 3rd party C extensions available for Ruby this isn’..
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@_nb__m: http://t.co/UeJjpvoryd

Ruby 2.1 In Detail. 단편적으로 알고 있던 것들이 많긴 한데 정리하니까 엄청 길어 보이네