Garbage collection: object properties
<p>Let's say I have an object that contains another objects as its properties like</p>

<pre><code>var obj = {
    '1': {...},
    '42': {...}
};
</code></pre>

<p>When <code>obj</code> gets out of scope - do all nested objects destroyed implicitly or I need to iterate over them and <code>delete</code> explicitly?</p>
