How are Int and String accepted as AnyHashable?

Question

How come I can do this?

    var dict = [AnyHashable : Int]()
    dict[NSObject()] = 1
    dict[\"\"] = 2

This implies that NSObject

Answer 1

class SomeClass: NSObject {
   var something: String = "something"
}

var dict = [AnyHashable: Int]()
var object = SomeClass()

dict = ["a": 1, object: 2]

print(dict["a"]) // result: Optional(1)
print(dict[object]) // result: Optional(2)

var object2 = SomeClass()
dict[object2] = 3
print(dict[object2]) // result: Optional(3)