Functions of fixed number of args are special-cased only for 3 or less args.

Author: pfalcon

py/objfun.c

@@ -63,7 +63,7 @@ mp_obj_t fun_native_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_
 
  return res;
 
- } else if (self->n_args_min == self->n_args_max) {
+ } else if (self->n_args_min <= 3 && self->n_args_min == self->n_args_max) {
  // function requires a fixed number of arguments
 
  // dispatch function call