ing argument to OCaml syntax (double quotes, escapes).</li>
<li><code class="code">c</code>: insert a character argument.</li>
<li><code class="code"><span class="constructor">C</span></code>: convert a character argument to OCaml syntax
     (single quotes, escapes).</li>
<li><code class="code">f</code>: convert a floating-point argument to decimal notation,
     in the style <code class="code">dddd.ddd</code>.</li>
<li><code class="code"><span class="constructor">F</span></code>: convert a floating-point 