Reason for .get() without index in jQuery API?

Let's say that I've got a page which extracts some image sources like so:

<div id="d">
  <img src="foo.gif"/>
  <img src="bar.gif"/>
  <img src="gah.gif"/>
</div>
<script type="text/javascript">
  var srcs = $('div#d > img').map(function(){return this.src});
  // srcs => ['foo.gif', 'bar.gif', 'gah.gif']
</script>

Note that srcs is not a JavaScript Array but an array-like object; we know this because of the fact that we can make jQuery API calls on objects returned by the selector and the fact that srcs.constructor != Array.

The jQuery API provides a .get() method which, when given no argument, returns a "standard" Array. Is there a compelling reason to use a standard Array instead of an array-like object or is this method just included for completeness?

[Edit]

To put it another way - what are the differences between a JavaScript Array and the array-like object returned by a jQuery selector?