turns for
          all flush options, and so can be used to determine the amount of currently
          consumed input in bits. The <code class="computeroutput"><span class="identifier">Flush</span><span class="special">::</span><span class="identifier">trees</span></code>
          option behaves as <code class="computeroutput"><span class="identifier">Flush</span><span class="special">::</span><span class="identifier">block</span></code>
          does, but it also returns when the end of each deflate bl