title: Why object spread throw error in latest Firefox?
body: <p>Please see this minimum spread code snippet</p>
  
  <pre class="lang-js prettyprint-override"><code>{...(false &amp;&amp; {hello: 'world'})}
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/KldpQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KldpQ.png" alt="enter image description here"></a></p>
  
  <p>Firefox version is 67.0.4（64 bit）</p>