implicitly
        convertible either to <code class="computeroutput">"5"</code> or to
        <code class="computeroutput">5.0</code>. Their indifference to interpretation but
        awareness of type effectively makes them safe, generic
        containers of single values, with no scope for surprises from
        ambiguous conversions.</p></li>
<li class="listitem"><p>
        Indiscriminate types that can refer to anything but are
        oblivious to the actual underlying type, entrusting all forms
   