Nice to see this, as it seems to address one of the most common concerns about using CoffeeScript. I have to wonder, though, how many minds will it really change? Maybe a lot, but I'm wondering how this will pan out. I'm guessing some people provide line matching for debugging as a concern but will continue to move the goal posts as this and other barriers are removed.

I feel like that's a pattern I see around here, which is odd because if you'd rather just use javascript that seems totally reasonable without an excuse.