config({ EXPONENTIAL_AT : [-7, 20] })
new BigNumber(123456789)    // '123456789'   e is only 8
new BigNumber(0.000000123)  // '1.23e-7'

// Almost never return exponential notation:
BigNumber.config({ EXPONENTIAL_AT : 1e+9 })

// Always return exponential notation:
BigNumber.config({ EXPONENTIAL_AT : 0 })</pre>
          </dd>
          <dd>
            Regardless of the value of <code>EXPONENTIAL_AT</code>, the
            <code>toFixed</code> method will always return a value in
            normal notatio