title: How to get properties of String Iterator Object using Object.keys?
body: <p>Consider the object:- <code>"ok"[Symbol.iterator]().__proto__</code></p>
  
  <p>This resolves to an object:-</p>
  
  <pre><code>String Iterator {Symbol(Symbol.toStringTag): "String Iterator", next: ƒ}
  </code></pre>
  
  <p>However <code>Object.keys()</code> does not list the object properties.</p>
  
  <pre><code>Object.keys("ok"[Symbol.iterator]().__proto__);
  </code></pre>
  
  <p>returns <code>[]length: 0__proto__: Array(0)</code></p>
  
  <p>Why?</p>