[ef4]

This is absolutely correct. The lack of consensus is the heart of the problem. There are several nice solutions (node-fibers being one), but none of them is dominant, so none of them work out of the box with everything else.

I'm convinced the only way you get this kind of consensus is by building a feature into your language's standard library. This is one big reason that languages with robust "batteries included" standard libraries have been successful. It makes it so much easier to interoperate when everyone can just assume the same abstractions are always available.