What about Proper Tail Calls? Duktape and XS support them. JSC has had them for years now too. That's a big feature to accidentally miss. You switch and then i

What about Proper Tail Calls? Duktape and XS support them. JSC has had them for years now too. That's a big feature to accidentally miss. You switch and then inadvertently blow your stack every now and then because v8 decided to remove their already implemented tail calls for no good reason (Lest we go down the road again, the "alternative syntax" proposal was dropped, so there's zero excuses aside from a deliberate violation of the spec).