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Rubyforge is now hosting an “initial pre-release of a preview of an alpha of an undocumented proof-of-concept” of the rewrite gem. Rewrite restricts things like andand or try to your code and your code alone. Sure, if you introduce a bug in your code, you may break things that directly depend on your code. But if you introduce “try” using rewrite instead of modifying Object, you will not reach out across your project and break something entirely unrelated that happens to have defined its own version of try in a completely different way.