Ok, fair enough, I can make a new version of the fakes that wraps the standard fakes.js if you want.
Just a sanity check: none of the implementations pass the --athrow test, right? I don't see how they could (at least not in general).

It would be nice to include case 3 in the analysis at some point, because that's where the different approaches differ (with fibers and SJS being the only ones that can handle this AFAICS)