The third edition of Rails will see an overhaul of the framework to merge the philosophies and features of the Merb framework into Rails. Among other things, that includes providing support for ORMs like DataMapper, Sequel (and even Hibernate!) and for JavaScript libraries like jQuery and Dojo. It will define an explicit public API for users and plugins, backed up by a test suite. It will have loads of performance enhancements, with the hope that Rails3 can be as performant as Merb is current...
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