title: My shape tween isn't reporting its size correctly
body: <p>If I <strong>shape tween</strong> between two rectangles like so:</p>
  
  <p><img src="https://i.stack.imgur.com/lyZVf.png" alt="enter image description here"></p>
  
  <p>On frame 5 I have the following:</p>
  
  <pre><code>trace(width);
  trace(height);
  trace(getRect(this));
  trace(getBounds(this));
  </code></pre>
  
  <p>I get back</p>
  
  <pre><code>49
  49
  (x=45, y=21, w=48, h=48)
  (x=44.5, y=20.5, w=49, h=49)
  </code></pre>
  
  <p>All <strong>wrong</strong>! These would be right for frame 1 but the rectangle is much wider than this by frame 5. The shape tween seems to be confusing the results.</p>
  
  <p>How can I get the actual rectangle of frame 5 without adding keyframes all across the timeline?</p>