ECMAScript continues to evolve and I suspect that there would have been an effort to make the spread operator into a sort of cons in JavaScript. It could have w

ECMAScript continues to evolve and I suspect that there would have been an effort to make the spread operator into a sort of cons in JavaScript. It could have worked for both arrays and objects. However, after seeing that the entry-level bar of proper tail calls couldn’t make it out the door for Chrome and V8, they might have decided not to push it and risk further divergence from a major implementation.