constructor(low, high) {
    /**
     * @const {number}
     * @private
     */
    this.low_ = low | 0;  // force into 32 signed bits.

    /**
     * @const {number}
     * @private
     */
    this.high_ = high | 0;  // force into 32 signed bits.
  }
@param {number} low  The low (signed) 32 bits of the long.
@param {number} high  The high (signed) 32 bits of the long.