I wonder if it would make sense to add a `parMapOrAccumulate` that returns an Ior.Both when some fai...

# arrow

[dave08]

I wonder if it would make sense to add a parMapOrAccumulate that returns an Ior.Both when some failed and some succeeded? Then Left would only be returned when they all failed, and Right when they all passed...

[simon.vergauwen]

Hmm, that would indeed be interesting and is probably one of the more interesting use-cases for Ior.