lts with overlapping polygons (fixed using point_on_surface for
          disjoint)
        </li>
<li class="listitem">
          <a href="https://svn.boost.org/trac/boost/ticket/8375" target="_top">8375</a>
          sym_difference of non-closed polygons returns closed polygon
        </li>
<li class="listitem">
          <a href="https://svn.boost.org/trac/boost/ticket/8376" target="_top">8376</a>
          difference of non-closed polygons returns closed polygon
        </li>
<li class="listitem">
      