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kotlinlang

if any one `enrichValue` fails, the whole operation fails. Else it aggregates the successes on the right, which you map to the update of your previous value.

hey <@U0B8UEMV1> this seems like a really handy composition.  where does `sequence` come from?   i see a sorta similar extfun on some of the other arrow types but not on `Either`

that sequence is the ListK one, from here: <https://github.com/arrow-kt/arrow/blob/master/modules/core/arrow-data/src/main/kotlin/arrow/data/ListK.kt#L77-L78>

so maybe that code needs to do `k()` to convert from List to ListK

In any case the Either one isn't there apparently. It'll be in 0.8.0. If we want it for 0.7.3 could you please PR it here?

<https://github.com/arrow-kt/arrow/blob/master/modules/core/arrow-instances-core/src/main/kotlin/arrow/instances/either.kt#L112-L113>

```
fun &lt;G, A, B&gt; EitherOf&lt;A, Kind&lt;G, B&gt;&gt;.traverse(GA: Applicative&lt;G&gt;): Kind&lt;G, Either&lt;A, B&gt;&gt; =
  traverse(GA, ::identity)
```

Awesome I’ll look at it today.  Thanks!