docs: public Future<?> startLoading(MapStoreContext mapStoreContext, boolean replaceExistingValues) {
          role.nextOrStay(Role.SENDER);
  
          if (state.is(State.LOADING)) {
              return keyLoadFinished;
          }
          state.next(State.LOADING);
  
          return sendKeys(mapStoreContext, replaceExistingValues);
      }