  isFinite<code class='inset'>.isF() &rArr; <i>boolean</i></code>
    </h5>
    <p>
      Returns <code>true</code> if the value of this BigNumber is a finite
      number, otherwise returns <code>false</code>.<br />
      The only possible non-finite values of a BigNumber are NaN, Infinity and
      -Infinity.
    </p>
    <pre>
x = new BigNumber(1)
x.isFinite()                  // true
y = new BigNumber(Infinity)
y.isF()                       // false</pre>
    <p>
      Note: The native method <code>isFi