@Override
  protected void validateScalarValue(@NotNull YAMLScalar scalarValue, @NotNull ProblemsHolder holder) {
    if (scalarValue instanceof YAMLQuotedText) {
      //TODO: quickfix would be nice here
      holder.registerProblem(scalarValue,
                             YAMLBundle.message("YamlBooleanType.validation.error.quoted.value"),
                             ProblemHighlightType.GENERIC_ERROR_OR_WARNING);
      return;
    }

    super.validateScalarValue(scalarValue, holder);
  }
@Override
  protected void validateScalarValue(@NotNull YAMLScalar scalarValue, @NotNull ProblemsHolder holder)