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I do wish CoffeeScript had stronger type support, however, I don't want to give up indentation, optional object brackets, optional function parens and easy loops.

There are a ton of other CoffeeScript features I love like the string interpolation syntax, comprehensions, implicit return, @ for this, improved switch syntax, ranges and a ton of other stuff, but I'm going to hang on to those first four for as long as its practical to do so.