idity of union/intersection/difference which were sometimes
          invalid. In most cases, results are valid now.
        </li>
<li class="listitem">
          Fixes in validity of buffer which were sometimes invalid. In most cases,
          results are valid now.
        </li>
<li class="listitem">
          Fixes in results of union/intersection/difference which could be incorrect
          in very complex cases
        </li>
<li class="listitem">
          Fixes in set and relational operations for n