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but it should be maybe more efficient, i.e. just trim the underlying array

Not sure, but I think `subList` could be the closest to what you want

<https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/sub-list.html>

```
Returns a view of the portion of this list between the specified fromIndex (inclusive) and toIndex (exclusive). The returned list is backed by this list, so non-structural changes in the returned list are reflected in this list, and vice-versa.
```

How that’s implemented though, I don’t know.

create a new object with reference to the same list, and throws on out of bounds, specificed in the sublist method