if let myArray = myArray as? [Int] {
    print("Type casting succeeded")
} else {
    print("Type casting failed")
}

import Foundation

protocol Identifiable {
    var `id`: String { get set }
}

protocol Base { }

@objc
class Foo: NSObject, Base { }

@objc
class Bar: NSObject, Base, Identifiable {
    @objc var id: String
    
    init(id: String) {
        self.id = id
    }
}

class Receiver<O: Base> {
    
    let store: [O]
    
    init(store: [O]) {
        self.store = store
    }
    
    @discardableResult
    func filterOut(_ objects: [O]) -> [O] {
        
        if let objects = objects as? [Identifiable] {
            
            let objectIds = objects.compactMap { $0.id }
            let predicate = NSPredicate(format: "NOT (id IN %@)", objectIds)

            let filtered = store.filter {
                predicate.evaluate(with: $0)
            }
            
            return filtered
            
        } else {
            
            return store
            
        }
    }
    
}

let barReceiver = Receiver(store: [Bar(id: "toto"), Bar(id: "tutu")])
print(barReceiver.filterOut([Bar(id: "toto")]))   //  [<Toto.Bar: 0x608000038540>]
print(barReceiver.filterOut([]))    // [<Toto.Bar: 0x608000036920>, <Toto.Bar: 0x608000038540>]

let fooReceiver = Receiver(store: [Foo(), Foo()])
print(fooReceiver.filterOut([Foo()]))   // [<Toto.Foo: 0x60400001c8e0>, <Toto.Foo: 0x60400001c8d0>]
print(fooReceiver.filterOut([]))    // CRASH