an class="token keyword">fun </span><span class="token operator">&lt;</span><a href="../-update-builder/update.html">T</a><span class="token punctuation">, </span><a href="../-update-builder/update.html">S</a><span class="token operator"> : </span><a href="../-update-builder/update.html">T</a><span class="token operator">?</span><span class="token operator">&gt; </span><a href="../-update-builder/update.html"><span class="token function">update</span></a><span class="token punctuation">(</span><span class="