class="identifier">is_mutable_buffer_sequence</span></code>
              </li>
<li class="listitem">
                New trait <code class="computeroutput"><span class="identifier">buffers_iterator_type</span></code>
              </li>
<li class="listitem">
                New trait <code class="computeroutput"><span class="identifier">buffers_type</span></code>
              </li>
</ul></div>
        </li>
<li class="listitem">
          New classes <code class="computeroutput"><span class="identifier">a