lass="kt">Data</span><span class="p">?,</span> <span class="kt">String</span><span class="p">?)</span> <span class="p">{</span>
     <span class="nf">let</span> <span class="p">(</span><span class="n">processor</span><span class="p">,</span> <span class="n">responseText</span><span class="p">)</span> <span class="o">=</span> <span class="nf">upgrade</span><span class="p">(</span><span class="nv">handler</span><span class="p">:</span> <span class="n">handler</span><span class="p">,</span> <span class="nv">re