for (int direction : new int[] {1, -1}) {
        double d = Double.longBitsToDouble(Double.doubleToLongBits(Math.scalb(1.0, i)) + direction);
        // Math.nextUp/nextDown
        if (d != Math.rint(d)) {
          fractionalBuilder.add(d);
        }
      }
    }
    for (double d :
        Doubles.asList(
            0,
            1,
            2,
            7,
            51,

      for (int direction : new int[] {1, -1}) {
        double d = Double.longBitsToDouble(Double.doubleToLongBits(Math.scalb(1.0, i)) + direction);
        // Math.nextUp/nextDown
        if (d != Math.rint(d)) {
          fractionalBuilder.add(d);
        }
      }
    }
    for (double d :
        Doubles.asList(
            0,
            1,
            2,
            7,
            51,

        }

      case HALF_EVEN:
        return rint(x);

      case HALF_UP:
        {
          double z = rint(x);
          if (abs(x - z) == 0.5) {
            return x + copySign(0.5, x);
          } else {
            return z;
          }
        }

      case HALF_DOWN:
        {
          double z = rint(x);
          if (abs(x - z) == 0.5) {
            return x;