     This wrapper flattens writes for buffer sequences having length greater than
        1 and total size below a predefined amount, using a dynamic memory allocation.
        It is primarily designed to overcome a performance limitation of the current
        version of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ssl</span><span class="special">::</span><span cla