<a href="https://github.com/zloirock/core-js/issues/548" rel="nofollow">https://github.com/zloirock/core-js/issues/548</a> has some interesting discussion and context around this, including a response from the author: <a href="https://github.com/zloirock/core-js/issues/548#issuecomment-494112872" rel="nofollow">https://github.com/zloirock/core-js/issues/548#issuecomment-...</a>