 sums, type <code>int</code>,</li>
<li><em><code>s1</code></em>: first (optional) shared argument, type <code>T1</code>, where <code>T1</code> can be any type</li>
<li><em><code>s2</code></em>: second (optional) shared argument, type <code>T2</code>, where <code>T2</code> can be any type,</li>
<li><em><code>...</code></em>: remainder of shared arguments, each of which can be any type.</li>
</ul>
</div>
<div id="functions-partial-sum" class="section level3">
<h3><span class="header-section-number">9.4.2</spa