The Google v8 team discontinued work on strong mode because ES6 is 2x - 10x slower across the board. <a href="https:&#x2F;&#x2F;twitter.com&#x2F;ahdinosaur&#x2F;status&#x2F;714999109741096960" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;ahdinosaur&#x2F;status&#x2F;714999109741096960</a>