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I have created a custom protocol,which i am planning to use in place of Any

But i doesn't work when i try to cast it from JSONSerialization.jsonObject

import Foundation
import CoreFoundation
//MARK:- Protocol
public protocol StringOrNumber {}

//MARK:- Protocol Extension
extension String:StringOrNumber {}
extension NSNumber:StringOrNumber {}
extension Bool:StringOrNumber {}
extension Float:StringOrNumber {}
extension Int32:StringOrNumber {}
extension Int64:StringOrNumber {}
extension Int:StringOrNumber {}
extension Double:StringOrNumber {}
extension Dictionary:StringOrNumber {}
extension Array:StringOrNumber {}
extension NSDictionary:StringOrNumber {}
extension NSArray:StringOrNumber {}
extension NSString:StringOrNumber {}
extension NSNull:StringOrNumber {}

//MARK:- Code
private func readJson() {
    let d = ["first":"john", "last":"doe"] as [String:Any]
    if let data = try? JSONSerialization.data(withJSONObject: d, options: []) {
        
        if let json = try? JSONSerialization.jsonObject(with: data, options: []) {
            // This Code Works ↓ ↓ ↓ ↓ ↓
            if let object = json as? [String: Any] {
                // json is a dictionary
                print("Hello World: \(object)")
                if let newObject:[String:StringOrNumber] = object as? [String:StringOrNumber] {
                    // json is a newer dictionary
                    print(newObject)
                }
            }
            //This Code Doesn't work ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
            let object:[String: StringOrNumber]? = json as? [String: StringOrNumber]
            // json is a dictionary
            print(object ?? "Dictionary is Empty")
        }
    }
}
readJson()

I don't understand why the first piece of code doesn't works and 2nd one does ...

Thanks