title: RedBean returns null when unboxing model from bean?
body: <p>I can't get the <code>box()</code> method to work, I only get <code>NULL</code> from it.</p>
  
  <p>For example if I do this</p>
  
  <pre><code>$bean = \R::load('comment', 2);
  
  print("\n\nBEAN:\n");
  var_dump($bean);
  
  $model = $bean-&gt;box();
  
  print("\n\nMODEL:\n");
  var_dump($model);
  </code></pre>
  
  <p>I get this</p>
  
  <pre><code>BEAN:
  class RedBeanPHP\OODBBean#68 (10) {
    protected $properties =&gt;
    array(4) {
      'id' =&gt;
      string(1) "2"
      'user' =&gt;
      string(1) "2"
      'reply_to' =&gt;
      NULL
      'message' =&gt;
      string(30) "Test comment 1"
    }
    protected $__info =&gt;
    array(4) {
      'type' =&gt;
      string(7) "comment"
      'sys.id' =&gt;
      string(2) "id"
      'sys.orig' =&gt;
      array(5) {
        'id' =&gt;
        string(1) "2"
        'user' =&gt;
        string(1) "1"
        'reply_to' =&gt;
        NULL
        'message' =&gt;
        string(30) "Test comment 1"
      }
      'tainted' =&gt;
      bool(false)
      'changed' =&gt;
      bool(false)
    }
    protected $beanHelper =&gt;
    class RedBeanPHP\BeanHelper\SimpleFacadeBeanHelper#17 (0) {
    }
    protected $fetchType =&gt;
    NULL
    protected $withSql =&gt;
    string(0) ""
    protected $withParams =&gt;
    array(0) {
    }
    protected $aliasName =&gt;
    NULL
    protected $via =&gt;
    NULL
    protected $noLoad =&gt;
    bool(false)
    protected $all =&gt;
    bool(false)
  }
  
  
  MODEL:
  NULL
  </code></pre>
  
  <p>Clearly there is data in the bean, so why does <code>box()</code> return <code>NULL</code>?</p>