title: Error with array_unique
body: <p>What am I doing wrong with this?  If I just run this:</p>
  
  <pre><code>$region = EM_Locations::get(array('orderby'=&gt;'region_name'));
  </code></pre>
  
  <p>all is good. However when I add in the array_unique:</p>
  
  <pre><code>$region = EM_Locations::get(array('orderby'=&gt;'region_name'));
  $reg = array_unique($region)
  </code></pre>
  
  <p>It breaks and get "EM_Location could not be converted to string"</p>