immutable.js get keys from map/hash : <p>I want to retrieve keys() from the following Immutable Map:</p>

<pre><code>var map = Immutable.fromJS({"firstKey": null, "secondKey": null });
console.log(JSON.stringify(map.keys()));
</code></pre>

<p>I would expect the output:</p>

<pre><code>["firstKey", "secondKey"]
</code></pre>

<p>However this outputs:</p>

<pre><code>{"_type":0,"_stack":{"node":{"ownerID":{},"entries":[["firstKey",null],["secondKey",null]]},"index":0}}
</code></pre>

<p>How to do it properly? </p>

<p>JSFiddle link: <a href="https://jsfiddle.net/o04btr3j/57/" rel="noreferrer">https://jsfiddle.net/o04btr3j/57/</a></p>
