Why mutate and mutateAsync both required?

[ellemedit]

I checked useMutation changes in migrating react-query 3.3 from 2.6.x of my project.
I don't understand why mutate and mutateAsync both needed. Both work in asynchronous and mutateAsync is forward compatibility of mutate. duplicating same function can cause confuse developers.

Could I know why?

[TkDodo]

the discussion originated here: #1111

and there is also a summary in the PR: #1130

[ellemedit]

Thank you!