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Previously, a version number for Ruby with an odd minor version number signified an experimental version. So Ruby 1.7 was experimental, while Ruby 1.8 was a production version. The Ruby core team has changed this so that, with the advent of Ruby 1.9.0, Ruby 1.9 is no longer considered experimental, although it may be a while before the implementation becomes ready for production use. (Borrowed from the web page: http://www.infoq.com/news/2007/12/ruby-19).