Option for optimistic updates

[shuding]

Discussed in #1721

^{Originally posted by SevenOutman December 23, 2021}
While there's example of making optimistic update with two separate mutate calls, why not add a new mutate signature to act as a shortcut?

mutate(newUser, updateUser(newUser), false)

// Equivalent to

mutate(newUser, false)
mutate(updateUser(newUser), false)
```</div>

[koba04]

This seems to be added as the optimisticData option in #1745 🚀

[shuding]

Yep, gonna close this issue, thanks!