Yep. The comment about eager languages I think is not really correct, as their eagerness is not really the problem. The problem is being bad at recursion and not having TCO, thus running into a stack overflow. But maybe even more correct would be to say that this or that JS engine doesn't implement TCO. Would Y have simply worked in Safari?
The Z combinator does work, but when you try to convert it into point-free form it starts crashing again. I tried pretty hard to avoid having to rewrite JavaScript for this article, but I couldn't find a way around it, since one of my constraints was making everything point-free.
Does anyone know off the top of their head if the Z combinator would just work here? (Instead of switching to Skoobert)