Looking at the new `accumulate` DSL in Arrow 2, I ...

# arrow

[Ulrich Schuster]

Looking at the new accumulate DSL in Arrow 2, I was surprised to see that `ensureNotNullOrAccumulate`returns Unit instead of the non-null value. The latter would be consistent with how ensureNotNull and requireNotNull works. Is there a reason for this surprising behavior?

[Youssef Shoaib [MOD]]

if the value is null, ensureNotNullOrAccumulate doesn't actually raise, instead it accumulates that error. This means that after that call, your value may still be null. Maybe it should return RaiseAccumulate.Value<T!!> though