title: Bundle.putParcelable / getParcelable pair returns same object instance
body: <p>I spent quite a while debugging a parcelable object acting weird in my application. Eventually I noticed, luckily, that an object sent via Bundle, in this case Fragment arguments, might be the exact same object I pass to it.</p>
  
  <p>Consider following code snippet in which <strong>r2</strong> is not a copy, as I would have expected, but the same object <strong>r</strong> instead;</p>
  
  <pre><code>Rect r = new Rect();
  Log.d("r", r.toString());     // Rect(0, 0 - 0, 0)
  Bundle bundle = new Bundle();
  bundle.putParcelable("KEY", r);
  Rect r2 = bundle.getParcelable("KEY");
  r2.set(100, 100, 100, 100);
  Log.d("r", r.toString());     // Rect(100, 100 - 100, 100)
  Log.d("r2", r2.toString());   // Rect(100, 100 - 100, 100)
  </code></pre>
  
  <p>Now the question would be is there documentation about this behaviour somewhere? I'm running into this behaviour on Android 5.1 on Nexus 5 and would be interested in knowing is this something that existed already in API 1 for example and in which situations it'll return a copy instead via creator.</p>
  
  <p>I'm sure there is but I fail to find correct search keywords.</p>