Description:
------------
Passing an array as a parameter with a type hint of Traversable causes a fatal error. I'd be nice if the basic array type could implement this interface so it can be used like this.

It appears this request is a duplicate of 33891, however it doesn't not appear to have any activity for almost 1 year.

Reproduce code:
---------------
function traversableTest(Traversable $items) {
    foreach($items as $item) {
        echo $item;
    }
}

traversableTest(array('one', 'two', 'three'));

Expected result:
----------------
onetwothree


Actual result:
--------------
Catchable fatal error: Argument 1 passed to traversableTest() must implement interface Traversable, array given, called in /home/jhendric/public_html/test.php on line 8 and defined in /home/jhendric/public_html/test.php on line 2