title: Why Object#hashCode() returns int instead of long
body: <p>why not:</p>
  
  <pre><code>public native long hashCode();
  </code></pre>
  
  <p>instead of: </p>
  
  <pre><code>public native int hashCode();
  </code></pre>
  
  <p>for higher chance of achieving unique hash codes?</p>