来自redux教程：

const onSavePostClicked = async () => {
  if (canSave) {
    try {
      setAddRequestStatus('pending')
      await dispatch(addNewPost({ title, content, user: userId }))
        .unwrap()
    } catch (err) {
      console.error('Failed to save the post: ', err)
    } finally {
      setAddRequestStatus('idle')
    }
  }
}

dispatch(addNewPost({ title, content, user: userId }))将返回这样的promise：

state: "fulfilled"

result: fulfilled action object

dispatch(addNewPost({ title, content, user: userId })).unwrap()也会返回一个promise。
那么不带unwrap的promise和带unwrap的promise有什么区别呢？

state: "fulfilled"

result: ?