Real Iterator Semantics (please)

[liamoc]

I know it is extending the run-time semantics of the language, but I think having real iterators instead of just arrays for comprehensions would be great.

[jashkenas]

Yeah, I wish, but it's kind of a rule I want to keep. There's a whole rabbit-hole of wonderful things we can get into if we assume that a CoffeeScript standard library will always be loaded.

If you'd like to pursue this, you should make a branch that breaks the rule all over and really goes to town with it.