title: Assign Multiple JsonProperties?
body: <p>I am trying to make a single dataclass that holds information from both Facebook and Twitter. </p>
  
  <p>but in my JSON reply from twitter I need <code>id_str</code> and from FaceBook I get <code>id</code>.</p>
  
  <p>I need those two to be put into the <code>id</code>-string. </p>
  
  <p>Now I know I can use <code>[JsonProperty("id_str")]</code> if I want to deserialize Twitters <code>id_str</code> into my <code>id</code>-string. </p>
  
  <p>But what if I need both Facebook's <code>id</code> and Twitters <code>id_str</code> to be deserialized in the same <code>id</code>-string I have in my dataclass?</p>