This may specific to your use case, but maybe you could use Iter[T] for passing the data? We encourage using Iter or Array to pass the data between structures.
In yesterday’s post: The MoonBit Update——0715 - Announcement - Moonbitlang, we are now supporting spread operator for anything that is kind of iterable. Since ArrayView is iterable, you can always pass convert ArrayView to Array with [..x].