code class="code"><span class="constructor">Hashtbl</span>.fold&nbsp;f&nbsp;tbl&nbsp;init</code> computes
   <code class="code">(f&nbsp;kN&nbsp;dN&nbsp;...&nbsp;(f&nbsp;k1&nbsp;d1&nbsp;init)...)</code>,
   where <code class="code">k1&nbsp;...&nbsp;kN</code> are the keys of all bindings in <code class="code">tbl</code>,
   and <code class="code">d1&nbsp;...&nbsp;dN</code> are the associated values.
   Each binding is presented exactly once to <code class="code">f</code>.
<p>

   The order in which the bindin