ified in the keys will never be casted.</p></td>
    </tr>
    <tr>
      <th>file</th>
      <td><p>Location and name of a text file to output the results to. Setting to NULL will cause no file to be produced.</p></td>
    </tr>
    <tr>
      <th>tolerance</th>
      <td><p>Set tolerance for numeric comparisons. Note that comparisons fail if (x-y)/scale &gt; tolerance.</p></td>
    </tr>
    <tr>
      <th>scale</th>
      <td><p>Set scale for numeric comparisons. Note that comparisons fail if (x-y)/scale