Hey all, I proposed some new changes for the flatt...

# arrow-contributors

[simon.vergauwen]

Hey all,
I proposed some new changes for the flattening of Validated. There is a series of PRs currently open, and I am looking for feedback. The mapOrAccumulate PR allows binding both Either<E, A> and EitherNel<E, A> in a single orAccumulate DSL. The following introduces the same to all other orAccumulate signatures and also removes a lot of code duplication, but also making a small breaking change in the alphas. Specifically here for Either.zipOrAccumulate, the code is now derived from the optimised Raise.zipOrAccumulate. But it works over lambdas instead of values, I also proposed parZipOrAccumulate which matches parMapOrAccumulate but for independent operations. The proposed Either.zipOrAccumulate now matches the also proposed parZipOrAccumulate.

Iterable.mapOrAccumulate and NonEmptyList.mapOrAccumulate are now also derived from the now more optimised Raise.mapOrAccumulate.

The biggest downside of it all is that without context receivers you need to more often specify type arguments 😞 but their is a very graceful migration from the current encoding to context receivers. You can find a lot more details in the PRs, but feel free to ask and questions or doubts in the PRs themselves ☺️