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I have an `Either<NonEmptyList<A>, B>` that I got from a function that validates my inputs. I want to transform `B` into `C`. Doing so requires more validations, so I'll get a type of `Either<NonEmptyList<A>, C>` . The `A` s are typed errors that inherit from the same base class. I want to accumulate the errors. I believe that `flatMap` overwrites the first `NonEmptyList<A>` with the second one. Is `bind` and `zipOrAccumulate` the way to go?

yes, any accumulation function would have the result you expect

When you have a B to transform, you won't have any existing As from that Either to merge or accumulate, so a flat map would suffice, no?