is method will always return normal notation.
    </p>
    <p>
      If <code>decimal_places</code> is omitted, or is <code>null</code> or
      undefined, then the return value is the same as <code>n.toString()</code>.
      This is  also unlike <code>Number.prototype.toFixed</code>, which returns
      the value to zero decimal places.
    </p>
    <p>
      See <a href='#Errors'>Errors</a> for the treatment of other
      non-integer or out of range <code>decimal_places</code> values.
    </p>
    <pre>
