title: Firebase Simulator: Cannot test writing data that is not JSON
body: <p>Since the simulator only allow writing JSON data, I cannot test scenario like this:</p>
  
  <pre><code>Location: users/uid123/age  
  Data: 25
  </code></pre>
  
  <p>I can only test:</p>
  
  <pre><code>Location: users/uid123  
  Data: {"age":25}
  </code></pre>
  
  <p>But they are different if I only allow write access to <code>/users/$uid/age</code> but not <code>/users/$uid</code></p>
  
  <p>How can I solve this problem?</p>