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I recently gave a talk at Philly.rb, the Ruby meetup in Philadelphia, PA entitled "The Cleanroom Pattern - More safely evaluating DSLs with Ruby". You can watch the full Cleanroom DSL video online, but I decided to also write the contents of the talk into a blog post. Background on DSLs Most Ruby-based DSLs are created using a simple instance_eval. While slightly less dangerous than eval, instance_eval still opens the system up to dangerous circumstances. Consider the following DSL file, Proje...