void Main()
{
    var code1 = new UTF8Encoding(true);
    var code2 = new UTF8Encoding(false);
    var code3 = new UTF8Encoding();
    var code4 = Encoding.UTF8;
    var code5 = Encoding.GetEncoding("UTF-8");
    
    code1.GetPreamble().Dump();
    code2.GetPreamble().Dump();
    code3.GetPreamble().Dump();
    code4.GetPreamble().Dump();
    code5.GetPreamble().Dump();
}