code: Parsed copy() {
          // only copy fields used in parsing stage
          Parsed cloned = new Parsed();
          cloned.fieldValues.putAll(this.fieldValues);
          cloned.zone = this.zone;
          cloned.chrono = this.chrono;
          cloned.leapSecond = this.leapSecond;
          return cloned;
      }
docs: Creates a copy.