using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        IReadOnlyDictionary<string, string> fakeIdentity = new Dictionary<string, string>();

        if (fakeIdentity is Dictionary<string, string> realIdentity)

        {

            Console.WriteLine("I lied about read only");

            realIdentity.Add("watch", "me");

        }

    }

}