  * contains methods that understand the interfaces in this package.
  * So, for example, removeFirst() understands Equalable and will remove
  * an element that is equals() to the specified element, rather than just
- * ===.
+ * === (strictly equals) to the specified element.
  */
 public class ArrayUtil
 {

     * Returns the index of the first item in the array for which the predicate function
     * returns true, or -1 if no such item was found. The predicate function should be of type:
     *   function (element :*) :Boolean { }
     */
    public static function indexIf (arr :Array, predicate :Function) :int
    {

        return -1; // never found
    }

    /**
     * @return true if the specified element, or one that is Equalable.equals() to it, is
     * contained in the array.
     */
    public static function contains (arr :Array, element :Object) :Boolean
    {
        return (indexOf(arr, element) != -1);
