That's what we usually do in C#. Required parameters as positional, and optional as named. doSomething(req_param_1_value, req_param_2_value, optional_param_1

That's what we usually do in C#. Required parameters as positional, and optional as named. doSomething(req_param_1_value, req_param_2_value, optional_param_1 : value, optional_param2: value);