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Charlie Nutter just published an article which assesses the various implementations of Ruby. In all it’s a quite even-handed description coming from one of the main proponents of JRuby. Charlie talks about each implementation and describes the perils each faces. These seem to be days of crisis for Ruby. With so many implementations compatibility is a challenge. Particularly since Ruby lacks a formal specification. The Rubinius developers have been working hard to address this by developing, RubySpecs, a set of rspec style specifications for Ruby.