What are `true` and `false` and 'null'?
<p>Why aren't they key words?  What are they?</p>

<pre><code>true, false, null
</code></pre>

<p><strong>Update Quick Answer</strong></p>

<p>These are reserved words but they are not keywords.</p>

<p>Small technical distinction verified by spec - ES3 and ES5</p>
