docs: public static boolean isConvertibleToPublisher(Class<?> type) {
          if (Publisher.class.isAssignableFrom(type)) {
              return true;
          } else {
              for (Class<?> reactiveType : REACTIVE_TYPES) {
                  if (reactiveType.isAssignableFrom(type)) {
                      return true;
                  }
              }
              return false;
          }
      }