@nickk you could create your own List-Type and use delegation

class MyImmutableList<T>(private val list: List<T>): List<T> by list

then the user won't be able to cast your list into a

MutableList

and therefore won't be able to edit it

isn't that just a reinvention of Collections.unmodifiableList ?

they are pretty similar, my example prohibits the cast to

MutableList<T>

,

Collections.unmodifiableList

just throws an exception when you call

add