All this comes from the fact that people think for some reason that coffeescript is a javascript variant. Obviously, it has been demonstrated that it's not: syntax is different, semantics are different.

Also, users of cs shouldn' t have to think about how one language "transpile" to another. Otherwise what would be the point of using cs? If coffeescript designers have provided a clear documentation of their language behaviour, users should refer to it, and not make wild guesses of how it behaves, or how it translates to js.

That said, I'm not an expert of either language.