title: How to check if object is Immutable?
body: <p>Immutable object can be an instance of:</p>
  
  <ul>
  <li><code>Immutable.List</code></li>
  <li><code>Immutable.Map</code></li>
  <li><code>Immutable.OrderedMap</code></li>
  <li><code>Immutable.Set</code></li>
  <li><code>Immutable.OrderedSet</code></li>
  <li><code>Immutable.Stack</code></li>
  </ul>