@Override
  public @NotNull ImmutableText subtext(int start, int end) {
    if (start < 0 || start > end || end > length()) {
      throw new IndexOutOfBoundsException();
    }
    if (start == 0 && end == length()) {
      return this;
    }
    if (start == end) {
      return EMPTY;
    }

    return new ImmutableText(myNode.subSequence(start, end));
  }
@Override
  public @NotNull ImmutableText subtext(int start, int end)