“A more serious point is that we can't avoid adding tail calls at some point if we cater to the functional
programming crowd. However, if we really intend to cater to them then we need to provide data structures that
are functional too, like lists and operations on them—unlike ES arrays, which are entirely imperative. Of course
users can implement those data structures themselves, if they have tail calls, but right now just adding tail calls
“for functional programming” seems like a half solution.” source...