message: Make Actor.OwnedItemData more robust
diff: @@ -436,7 +436,7 @@ declare namespace Actor {
  * @typeParam D - Actor.Data to extract Item type from
  * @internal
  */
  - type OwnedItemData<D> = D extends Data<any, infer I> ? I : never;
  + type OwnedItemData<D extends Data> = D['items'][0];
  /**
  * @typeParam D - Type for `data.data`
  