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`Option` and nullable types have a top level `zip` function (for combining values).... `Either` and `Validated` only have it as member function... any specific reason for this?

Zip for nullable can only be done as a top level function because it would be confusing if we have a nullable list or flow for instance. I imagine that it was done at the same time as Option.

It would be great to have both options for all of the ADTs that we provide in arrow. Good catch. Worth a GH issue and PR :100:

Isn’t `Option` zip a member function? :thinking_face:

Nullable cannot have it, because it conflicts with all types ike Pablisco mentions

You are right, `Option` does seem to have a member zip:
<https://github.com/arrow-kt/arrow/blob/main/arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Option.kt#L384>