Another big development (it probably happened after the article was published) : Ruby 2.0-dev adds copy-on-write support similar to Ruby Enterprise Edition's h

Another big development (it probably happened after the article was published) : Ruby 2.0-dev adds copy-on-write support similar to Ruby Enterprise Edition's http://www.ruby-forum.com/topic/3367884 http://www.ruby-forum.com/topic/3367884