KtList (and others) has no const factories

[myvaheed]

KtList (and others) has no const factories with const initializers. For example, KtList.of(1, 2, 3). And therefore no available pass constructed list with const to const constructors:

class State {
    final KtList<int> keys;
    const State(this.keys);
}
...

final state = const State(KtList.of(1, 2, 3, 4)); //no compile