StandardMethodContract.ValueConstraint toValueConstraint() {
    return switch (this) {
      case False -> StandardMethodContract.ValueConstraint.FALSE_VALUE;
      case True -> StandardMethodContract.ValueConstraint.TRUE_VALUE;
      case NotNull -> StandardMethodContract.ValueConstraint.NOT_NULL_VALUE;
      case Null -> StandardMethodContract.ValueConstraint.NULL_VALUE;
      default -> StandardMethodContract.ValueConstraint.ANY_VALUE;
    };
  }
StandardMethodContract.ValueConstraint toValueConstraint()