I'm getting

kotlinx.serialization.SerializationException: Class 'TreeSet' is not registered for polymorphic serialization in the scope of 'SortedSet'.

what can I do about this? It's after I use

.toSortedSet()

on a set... I just really want to keep the sorted order of the set, can I just do

Iterable.toSortedSet().toList()

on it and get the same result, or is there a better/more efficient way?