sS replaceDollarVars_withCustomToString(IF1<O, S> stringifier, S s, O... params) {
  if (empty(params)) ret s;
  MapSO vars = mapKeys dropDollarPrefix((MapSO) litcimap(params));
  ret replaceDollarVars_dyn(s, var -> {
    O value = vars.get(var);
    ret value == null ?: stringifier.get(value);
  });
}

sS replaceDollarVars_withCustomToString(S s, IF1<O, S> stringifier, O... params) {
  ret replaceDollarVars_withCustomToString(stringifier, s, params);
}

Began life as a copy of #1028680