Coffeescript `in` operator doesn't work with 2D array
<p>Checking for values in 1D arrays works..</p>

<pre><code>coffee&gt; 1 in [1,2]
true
</code></pre>

<p>But:</p>

<pre><code>coffee&gt; [1, 1] in [[1, 1], [1, 2]]
false
</code></pre>

<p>Checking for values in 2D arrays doesn't.</p>

<p>Am I missing something, is this a bug or is this intended?</p>