nullableDouble

fun JsonModel?.nullableDouble(key: String? = null, default: JsonObjectDefaultSelector<Double?>): JsonDelegateProperty<Double?>
fun JsonModel?.nullableDouble(key: String? = null, default: Double?): JsonDelegateProperty<Double?>
fun JsonModel?.nullableDouble(key: String): JsonDelegateProperty<Double?>
val JsonModel?.nullableDouble: JsonDelegateProperty<Double?>