Interface default parameters

Program.cs

using System;

namespace Defaults
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            new Foo().Bar();
            ((IFoo) new Foo()).Bar();
        }
    }

    internal interface IFoo
    {
        void Bar(bool test = true);
    }

    internal class Foo : IFoo
    {
        public void Bar(bool test = false)
        {
            Console.WriteLine(test);
        }
    }
}