case ClassComponent:
      case FunctionComponent:
      case ContextConsumer:
      case MemoComponent:
      case SimpleMemoComponent:
         For 
         We 
         esl
        return (getFiberFlags(nextFiber) & PerformedWork) === PerformedWork;
       Not
       so 
      default:
         For 
         to 
        return (
          prevFiber.memoizedProps !== nextFiber.memoizedProps ||
          prevFiber.memoizedState !== nextFiber.memoizedState ||
          prevFiber.ref !== nextFiber.ref
        );
    }
  }
  const pendingOperations: Array<number> = [];
  const pendingRealUnmountedIDs: Array<number> = [];
  const pendingSimulatedUnmountedIDs: Array<number> = [];
  let pendingOperationsQueue: Array<Array<number>> | null = [];
  const pendingStringTable: Map<string, number> = new Map();
  let pendingStringTableLength: number = 0;
  let pendingUnmountedRootID: number | null = null;
  function pushOperation(op: number): void {
    if (__DEV__) {