Database.createObjectStore with keyPath and autoincrement ?

[razorree]

In 'Transaction.kt' there is

public fun Database.createObjectStore(name: String, autoIncrement: AutoIncrement): ObjectStore

and

public fun Database.createObjectStore(name: String, keyPath: KeyPath): ObjectStore

but there is no function with keyPath and autoincrement, why? from the code I don't know if aforementioned function means other option is on. (If I use autoincrement=true, what's id field name? just id?)

IDBObjecStore has a function with a parameter:

public external interface IDBCreateObjectStoreOptions : JsAny {
    public var autoIncrement: Boolean?
    public var keyPath: IDBKeyPath?
}