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When using Arrow with Android, how would one pass an instance like Either via an Intent, since Intent requires the Either to be Serializable or Parcelable?

I guess I could write a custom Parceler...

But I think there may be no generic way to do so...

Untitled

Not great.  There's that extra level of wrapping :disappointed:

Hey Julian,

It's not really possible to make `Either` implement `Serializable` or  certainly not `Parcelable` with the reason being that we'd need to constraint `A` and `B` to also be `Serializable`. (and `Parcelable` requires a dependency on Android).

I think the easiest approach here is to save `TempItemId` and `PermItemId` into `Intent` by unwrapping it from `Either` using `fold` or `when` and to wrap it again when you extract it from the `Intent`

Scala's Either is serializable: <https://www.scala-lang.org/api/current/scala/util/Either.html|https://www.scala-lang.org/api/current/scala/util/Either.html>

What would be the use case where you have things that are not serializable as values inside either?

Oh, seems I was mistaken :sweat_smile: It's just an empty `interface Serializable` with no methods. I thought it was like `interface Comparable` which requires you to restrict `A` and `B` to be `A : Comparable` and `B : Comparable` in order to correctly implement `compareTo`.

However, Effective Java recommends to *never* implement `Serializable` unless you need to inter-opt with legacy systems. Making `Either` `Serializable` for putting it in an `Intent` seems backwards since on Android `Parcelable` is definitely the way to go and not `Serializable`.

so you are saying Android is a legacy system :troll:

<@UDAV1EN4W> <https://twitter.com/greenrobot_de/status/1364590644224815107?s=20>

<https://twitter.com/s_anastasov/status/1364566758582063105?s=19|https://twitter.com/s_anastasov/status/1364566758582063105?s=19>

<https://android-review.googlesource.com/c/platform/libcore/+/1601554|https://android-review.googlesource.com/c/platform/libcore/+/1601554>