nbsp;total&nbsp;x</code> computes a hash value for <code class="code">x</code>,
   with the same properties as for <code class="code">hash</code>. The two extra integer
   parameters <code class="code">meaningful</code> and <code class="code">total</code> give more precise control over
   hashing. Hashing performs a breadth-first, left-to-right traversal
   of the structure <code class="code">x</code>, stopping after <code class="code">meaningful</code> meaningful nodes
   were encountered, or <code class="