`Array#first` to treat 1 argument case specially to improve performance.
MODIFY
src/array.c
src/array.c
@@ -931,9 +931,10 @@ mrb_ary_first(mrb_state *mrb, mrb_value self)
struct RArray *a = mrb_ary_ptr(self);
mrb_int size, alen = ARY_LEN(a);
- if (mrb_get_args(mrb, "|i", &size) == 0) {
+ if (mrb->c->ci->argc == 0) {
return (alen > 0)? ARY_PTR(a)[0]: mrb_nil_value();
}
+ mrb_get_args(mrb, "|i", &size);
if (size < 0) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "negative array size");
}

`Array#first` to treat 1 argument case specially to improve performance.