s) possible to identify other element
   values between two given values.  For example, a range over the
   <code class="type">numeric</code> type is continuous, as is a range over <code class="type">timestamp</code>.
   (Even though <code class="type">timestamp</code> has limited precision, and so could
   theoretically be treated as discrete, it's better to consider it continuous
   since the step size is normally not of interest.)
  </p><p>
   Another way to think about a discrete range type is that ther