No toString method
<p>I'm learning JavaScript and I found in the codebase an if statement which part of it is redundant.</p>

<pre><code>if(undefined === value || null === value || !value.toString)
</code></pre>

<p>Is there something in js that doesn't have <code>toString</code> defined (apart from <code>undefined</code> and <code>null</code>)?</p>
