/Web/JavaScript/Data_structures#Number_type" class="type">&#x3C;integer></a></li>
<li><code>level</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type">&#x3C;integer></a> (compression only)</li>
<li><code>memLevel</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type">&#x3C;integer></a> (compression only)</li>
<li><code>strategy</code> <a href="https://developer.mozilla.org/en-US/docs/Web/J