public static void Main()
Console.WriteLine($"obj == null: " + (obj == null));
Console.WriteLine($"obj is null: " + (obj is null));
public static bool operator== (MyType a, MyType b) => true;
public static bool operator!= (MyType a, MyType b) => false;
public override bool Equals(object other) => other is MyType;
public override int GetHashCode() => 0;