internal override IDictionary <string, IOpenApiAny> ToDictionary()
 {
     return
         ((ApiKeySourceOptions?.ToDictionary() ?? new Dictionary <string, IOpenApiAny>())
          .Union(CorsOptions?.ToDictionary())
          .Union(BinaryMediaTypesOptions?.ToDictionary())
          .Union(AmazonApiGatewayRequestValidators?.ToDictionary())
          .Union(RequestValidatorOptions?.ToDictionary())
         );
 }