title: Firebase not converting '{".sv": "timestamp"}' to server timestamp
body: <p><a href="https://i.stack.imgur.com/kavnA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kavnA.png" alt="Here is a Screenshot of written document." /></a></p>
  <p>What am I missing here ?</p>
  <p>Code looks something like:</p>
  <pre><code>localDocument['a3'] = {&quot;.sv&quot;: &quot;timestamp&quot;};
  </code></pre>
  <p>where <code>a3</code> is supposed to be server timestamp field in this document.</p>