Table without thead in Panel

Created by: ottob

If I use this I get a 2px border between then panel-heading and the table. I expected it to be 1px. Feature or bug?

<div class="panel panel-default">
  <div class="panel-heading">Panel heading</div>
  <table class="table">
    <tbody>
      <tr>
        <th>Foo</th>
        <td>Bar</td>
      </tr>
    </tbody>
 </table>
</div>