Pat Finnigan

@nevir Yeah I think it's the latter. In this case the ID has not changed, we're persisting a small update to the existing entity.

@nevir yeah I think `writeData` may be ideal. Spreading the existing object value makes sense and works, but this still seems like a gotcha since the cache supports partial fragment...

We also want this for GroupBy and other lo functions. Workaround: ``` var groupByError error entityIDsByType := lo.GroupBy(input.EntityIds, func(entityID entity.EntityID) entity.EntityType { entityType, err := entity.EntityTypeFromEntity(entityID) if err != nil...