any of the above properties is
      <code>null</code> or undefined it is ignored. See
      <a href='#Errors'>Errors</a> for the treatment of invalid values.
    </p>
    <pre>
BigNumber.config({
    DECIMAL_PLACES : 40,
    ROUNDING_MODE : BigNumber.ROUND_HALF_CEIL,
    EXPONENTIAL_AT : [-10, 20],
    RANGE : [-500, 500],
    ERRORS : true
});

// Alternatively but equivalently:
BigNumber.config( 40, 7, [-10, 20], 500, 1 )

obj = BigNumber.config();
obj.ERRORS       // true
obj.RANGE        // [-500, 500]