Understanding this line of jQuery
<p>Line 3906 of jQuery 1.7rc1 is</p>

<p><code>expando = "sizcache" + (Math.random() + '').replace('.', ''),</code></p>

<p>I don't understand the point of using <code>+ ''</code>. Isn't the above equivalent to</p>

<p><code>expando = ("sizcache" + Math.random()).replace('.', ''),</code></p>
