Ruby 1.9 was released on Christmas Day of 2007 as version 1.9.0, after undergoing a year or so as an experimental testbed for changes to the Ruby language and core class library.
Some Rubyists, who took the release as a signal to jump on the new version of Ruby, discovered that existing Ruby code was breaking due to the intentional incompatibilities between the 1.8 and 1.9 versions of the language. This quickly became a topic of discussion on the ruby-talk list.
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