rototype object.
    </p>
    <p>
      A BigNumber is immutable in the sense that it is not changed by its
      methods.
    </p>
    <p>
      The treatment of &plusmn;<code>0</code>, &plusmn;<code>Infinity</code> and
      <code>NaN</code> is consistent with how JavaScript treats these values.
    </p>
    <p>
      Method names over 5 letters in length have a shorter alias (except
      <code>valueOf</code>).<br />
      Internally, the library always uses the shorter method names.
    </p>



    <h5 