Oh hi, fancy seeing you here :]<p>Note that ptc syntax _ensures_ tail calls, tail calls themselves have _already_ been approved in ES2015 and are live in V8 (under a flag), you can follow their status here:  <a href="https:&#x2F;&#x2F;bugs.chromium.org&#x2F;p&#x2F;v8&#x2F;issues&#x2F;detail?id=4698" rel="nofollow">https:&#x2F;&#x2F;bugs.chromium.org&#x2F;p&#x2F;v8&#x2F;issues&#x2F;detail?id=4698</a>