using System;

using System.IO;

using System.Text;

using Microsoft.Extensions.Configuration;

public class Program

{

    public static void Main()

    {

        var cfgStr = """

        {

            "yabba" : true,

            "zabba" : "true"

        }

        """;

        using var cfg = new MemoryStream();

        cfg.Write(Encoding.UTF8.GetBytes(cfgStr));

        cfg.Seek(0, SeekOrigin.Begin);

        IConfiguration config = new ConfigurationBuilder().AddJsonStream(cfg).Build();

        Console.WriteLine(config["yabba"]);

        Console.WriteLine(config["zabba"]);

        Console.WriteLine(config.GetValue<bool>("yabba"));

        Console.WriteLine(config.GetValue<bool>("zabba"));

        Console.WriteLine(config["xabba"]);

        Console.WriteLine(config.GetValue<bool>("xabba"));

    }

}