initiate(): is isError always false if isSuccess is true and vice versa?

[pseidemann]

I'm wondering if this statement always holds true (in both directions) when using await dispatch(someEndpoint.initiate()):

$$ \mathrm{isError} = \neg\mathrm{isSuccess} $$

maybe it's possible that both are false? I couldn't find anything about that in the docs

[phryneas]

Those two are exclusive from each other. You can have an error and data, though.