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The motivation behind Effect<R, Option.Option<E>, A> and the possibility of optional errors

Out of curiosity, what's the motivation behind something like

Effect<R, Option.Option<E>, A>

Effect<R, Option.Option<E>, A>

? When would an error ever be "optional"? In the case of Effect.head for example wouldn't

Effect<R, E | NoSuchElementException, A>

Effect<R, E | NoSuchElementException, A>

make more sense?

The motivation behind Effect<R, Option.Option<E>, A> and the possibility of optional errors - Effect Community