Get rid of those boolean function parameters (2015)(mortoray.com)

    my_func((my_struct_t){
        .a_bool_flag = true,
        .another_bool_flag = false,
        .a_string = "Hello World"
    });

    v = calc_formula(ia, ib, is_gain=true)

    function calc_formula({a, b, is_gain}){
        ...
    }

    calc_formula({a:1, b:2, is_gain:true})

    type FuncParam = (fpDoThis, fpDoThat);
    type FuncParams = set of FuncParam;

    function MyFunc(arg1, arg2: integer; params: FuncParams): integer;
    begin
      result := 0;
      if (fpDoThis in params) then
         result := DoThis(arg1);
      ...
    end;

    // supply directly
    MyFunc(123, 42, [doThis, doThat]);

    // or indirectly
    params := [];
    if (condition) then
      Include(params, doThat);

    MyFunc(111, 222, params);
    

  (defun calc-formula (ia ib &optional (gain t))
    ...)

  (defvar *gain-enabled* t)

  (defun calc-with-gain (ia ib)
    ...)

  (let ((*gain-enabled* nil))
    (defun calc-without-gain (ia ib)
      ...))

    to decide what number is  the calculated formula for (a: a number) and (b: a number), with gain or without gain

   If with gain, decide on a+b;

    Let c be the calculated formula for 3 and 4, with gain

    To recount the story so far, cursorily or in great detail…

    A chair can be comfy.
    The table can be scratched. 

   A chair can be comfy or hard.

   The overstuffed armchair is a comfy chair in the living room. 

   If the target is a comfy chair…