 is created with <code class="code">~random:<span class="keyword">false</span></code> uses a
   fixed hash function (<a href="Hashtbl.html#VALhash"><code class="code"><span class="constructor">Hashtbl</span>.hash</code></a>) to distribute keys among
   buckets.  As a consequence, collisions between keys happen
   deterministically.  In Web-facing applications or other
   security-sensitive applications, the deterministic collision
   patterns can be exploited by a malicious user to create a
   denial-of-ser