How to get Expired Object If Present Only?

[terasupernova]

Hi, is there any method to get expired object only?

If i set returnExpiredObjectIfPresent = true In the following method,

open func object(forKey key: String, returnExpiredObjectIfPresent: Bool = false) -> T? {

will return me the whole object, then how to differentiate which object is expired or not ?

Thank you