     </dd>
      <dd>
        A numeric value.
      </dd>
      <dd>
        Legitimate values include <code>&plusmn;0</code>,
        <code>&plusmn;Infinity</code> and <code>NaN</code>.
      </dd>
      <dd>
        Values of type <em>number</em> with more than 15 significant digits are
        considered invalid as calling <code>toString</code> or
        <code>valueOf</code> on such numbers may not result in the intended
        value.
      </dd>
      <dd>
        There is no limit to the number of d