[lmm]

> The first run through, useState() returns the default value and your code runs to completion.

Your function was still sliced into the part before and the continuation (Dispatch) after though, right? The React runtime calls that continuation immediately with the default value, so you don't notice the suspension, but control flow wise it's still React calling your code twice rather than once.

[Izkata]

Nope, it's a normal function that updates some variables in the React module then returns two values. There's a little bit of magic going on, with how it knows which component it's in, but that's happening outside of the individual hooks.