Initializing a parser with the configuration lambda does nothing.

A requirement for my project involves that the command line arguments that I pass in look like `argumentKey=argumentValue`. I recognize that this tool defaults to parsing items as `--argumentKey=argumentValue`. So I naturally was led into trying the following.

```cs
static void Main(string[] args){
var parser = new Parser(config => config.EnableDashDash = false);

return parser.ParseArguments(args)
.MapResult(RunMyProgram, errors => -1);
}
```

Problem is though, initializing that new Parser has no effect on the program and there doesn't seem to be any documentation on how to configure the parser.

Any help on this is much appreciated!

从报告中显示的 Parser 构造函数和 ParseArguments(args) 调用开始，并使用 argumentKey=argumentValue 复现该行为。确认预期的配置路径，并记录或测试结果，使 lambda 不再不起作用。

由索引模型根据 Issue 内容生成。