this.features = Helpers.copyToSet(features);
    this.expectedElements = Helpers.copyToList(expectedElements);
    this.knownOrder = knownOrder;
    this.startIndex = startIndex;
  }

  /**
   * I'd like to make this a parameter to the constructor, but I can't because the stimulus
   * instances refer to {@code this}.
   */

   * end).trimmed()}.
   */
  public ImmutableIntArray subArray(int startIndex, int endIndex) {
    Preconditions.checkPositionIndexes(startIndex, endIndex, length());
    return startIndex == endIndex
        ? EMPTY
        : new ImmutableIntArray(array, start + startIndex, start + endIndex);
  }

  /**

   * end).trimmed()}.
   */
  public ImmutableDoubleArray subArray(int startIndex, int endIndex) {
    Preconditions.checkPositionIndexes(startIndex, endIndex, length());
    return startIndex == endIndex
        ? EMPTY
        : new ImmutableDoubleArray(array, start + startIndex, start + endIndex);
  }

  /**

}

const stateName = "UnconnectedConnectingConnectedConnectionErrorShutdown"

var stateIndex = [...]uint8{0, 11, 21, 30, 45, 53}

func (i State) String() string {
	if i >= State(len(stateIndex)-1) {
		return "State(" + strconv.FormatInt(int64(i), 10) + ")"
	}
	return stateName[stateIndex[i]:stateIndex[i+1]]