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I think these exist in kotlinx-immutable-collections under the name `removingAt` and `insertingAt` respectively, or smthn similar.
Might be a good idea to use that library if you're copying lists often like that (`PersistentList` will be wayyyyy more performant than `ArrayList` here)

Oh, I was unaware of this package... Good suggestion thank you.

<https://kotlinlang.org/api/kotlinx.collections.immutable/kotlinx-collections-immutable/kotlinx.collections.immutable/-persistent-list/removing-at.html?query=open%20fun%20removingAt(index:%20Int):%20PersistentList%3CE%3E|https://kotlinlang.org/api/kotlinx.collections.immutable/kotlinx-collections-immutable/kotlinx.collections.immutable/-persistent-list/removing-at.html?query=open%20fun%20removingAt(index:%20Int):%20PersistentList%3CE%3E>
<https://kotlinlang.org/api/kotlinx.collections.immutable/kotlinx-collections-immutable/kotlinx.collections.immutable/-persistent-list/adding-at.html?query=open%20fun%20addingAt(index:%20Int,%20element:%20E):%20PersistentList%3CE%3E|https://kotlinlang.org/api/kotlinx.collections.immutable/kotlinx-collections-immutable/kotlinx.collections.immutable/-persistent-list/adding-at.html?query=open%20fun%20addingAt(index:%20Int,%20element:%20E):%20PersistentList%3CE%3E>