 return false or true.
(The comparison operators are extended to work for multiple arguments using
multiple calls to <code class="mendoza-code">compare</code>).  The algorithm for the <code class="mendoza-code">compare</code>
function is as follows:
</p>
<ul><li>if <code class="mendoza-code">a</code> implements <code class="mendoza-code">:compare</code> and <code class="mendoza-code">(:compare a b)</code> is not nil, then return <code class="mendoza-code">(:compare a b)</code></li>
  <li>if <code class="men