title: in_array() does not work as expected
body: <p>For this array <code>($options)</code>:    </p>
  
  <pre><code>Array (
      [0] =&gt; 0
      [1] =&gt; 1
      [2] =&gt; 2
  )
  </code></pre>
  
  <p>PHP returns TRUE:</p>
  
  <pre><code>$this-&gt;assertTrue( in_array('Bug', $options ) );         // TRUE
  $this-&gt;assertTrue( in_array('Feature', $options ) );     // TRUE
  $this-&gt;assertTrue( in_array('Task', $options ) );        // TRUE
  $this-&gt;assertTrue( in_array('RockAndRoll', $options ) ); // TRUE  
  </code></pre>
  
  <p>Why?</p>