Add `buildPersistentList { }`, `buildPersistentMap { }`, `buildPersistentSet { }` to match the [collection builders in kotlin stdlib](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/build-list.html) I would imagine it would look something like this: ```kotlin fun <E> buildPersistentList(block: PersistentList.Builder<E>.() -> Unit): PersistentList<E> = persistentListOf<E>().builder().apply(block).build() ```