Can I make generated Swift protocol properties covariant? My case: Kotlin:

interface Article {
    val id: Int
    val category: Category
}

interface Category {
    val id: Int
}

Swift:

@objc
class RealmArticle: Object, KNArticle {
    @objc dynamic var id: Int32 = 0
    @objc dynamic var category: RealmCategory = RealmCategory() // type does not conform to protocol KNArticle
}

@objc
class RealmCategory: Object, KNCategory {
    @objc dynamic var id: Int32 = 0
}

@objc dynamic var category: RealmCategory = RealmCategory() // type does not conform to protocol KNArticle

This limitation is imposed by Swift, not Kotlin. How do you suggest to change generated

KNArticle

protocol to support covariant overriding in Swift?