title: Tabulator 4.2: sorter:"date" not working?
body: <p>Even in the example given @ the Tabulator site:</p>
  
  <p><a href="http://tabulator.info/basic/4.2" rel="nofollow noreferrer">http://tabulator.info/basic/4.2</a></p>
  
  <p>the date column does not sort, unlike the others.  Is there a fix for that?</p>