class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span>          <span class="special">=</span> <span class="identifier">conversion_traits</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">S</span><span class="special">&gt;</span>
             <span class="keyword">class</span> <span class="identifier">OverflowHandler</span>  <span class="special">=</span> <span class="identifier">def_overf