docs: private static List<Class> checkMergePolicy(SplitBrainMergeTypeProvider mergeTypeProvider, Object mergePolicyInstance) {
          if (mergePolicyInstance instanceof SplitBrainMergePolicy) {
              return checkSplitBrainMergePolicy(mergeTypeProvider, (SplitBrainMergePolicy) mergePolicyInstance);
          }
          return null;
      }