Is Float, Double, Int an AnyObject?

Question

I read inline documentation of Swift and I am bit confused.

1) Any is a protocol that all types implicitly conform.

2) AnyObject

Answer 1

class Test {

static func test() {
    let anyObjectsValues: [AnyObject] = [1, "Two", 3, "Four"] as [AnyObject]
    anyObjectsValues.forEach { (value) in
        switch value {
        case is Int:
            print("\(value) is an Int!")
        case is String:
            print("\(value) is a String!")
        default:
            print("\(value) is some other type!")
        }
    }
}

}

I have not imported UIKit or Foundation frameworks. Why compiler is not giving any error? Even it printing the result.

Output:

1 is an Int!

Two is a String!

3 is an Int!

Four is a String!

Does anybody have an idea?