title: Annotation to make Jackson interpret field either as JSON array or JSON object
body: <p>I have this model:</p>
  
  <pre><code>class Platform {
     private List&lt;ACL&gt; acl;
  }
  </code></pre>
  
  <p>Whereas the source from the server can be </p>
  
  <pre><code>{ "acl" : [{ "id" : 1 }, { "id" : 2 }] } 
  </code></pre>
  
  <p>or just a single Object</p>
  
  <pre><code>{ "acl" : "{ "id" : 1 } } 
  </code></pre>
  
  <p>Is there a way to program Jackson to interpret field either as JSON array or JSON object? </p>