 yet. When it is, it will keep
                  track of all iterators and make sure that they are all valid. This
                  will be mostly useful for debugging purposes as it will incur significant
                  overhead.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <span class="bold"><strong>StoragePolicy</strong></span> classes
                </p>
              </td>
<td class="auto-generated"> </td>
</tr>
<tr>
<td>
                <p>
    