title: How do you append objects in Folly Dynamic?
body: <p>How do you append values in to the dynamic object?</p>
  
  <p>If I do this :</p>
  
  <pre><code>Metrics["something"] = folly::dynamic::object("yet", 25);
  Metrics["something"] = folly::dynamic::object("Notyet", 255);
  </code></pre>
  
  <p>I am getting</p>
  
  <pre><code>{
   "something" : {
      "Notyet" : 255
    }
  }
  </code></pre>
  
  <p>Since I am iterating values and adding keys and values into it as I go, How Do I get</p>
  
  <pre><code>{
   "something" : {
      "Notyet" : 255,
      "yet" : 25
    }
  }
  </code></pre>
  
  <p>I looked around, I do not see an append method, there is support for adding multiple values at the time of creation, but I need it to do it over iteration</p>