Would you know that some Javascript engines store primitives on the heap, so potentially it can all be described as call-by-sharing? Then again, they are immutable, so it is indistinguishable from call-by-value.

I think making these distinctions is somewhat asinine and that it doesn't really do more than make people aware that the function call interface actually has some interesting design considerations. It's sort of like "ok, we have decided whether a hamburger is a sandwich. Now we can finally do the thing that desperately depended on this decision, which was, uhh..."