Maybe we should just make it common practice to do: Array.prototype.flatten = Array.prototype.flat Similar to "* { box-sizing: border-box; }" has become standa

Maybe we should just make it common practice to do: Array.prototype.flatten = Array.prototype.flat Similar to "* { box-sizing: border-box; }" has become standard. If they can't add an official .flatten for backwards compatibility now, we can assume they never will, right?