`ary_dup()` should not use `ary_replace(); fix
Otherwise the duplicated object may have shared entities that
should not be modified in-line.
@@ -684,11 +684,7 @@ mrb_ary_set(mrb_state *mrb, mrb_value ary, mrb_int n, mrb_value val)
static struct RArray*
ary_dup(mrb_state *mrb, struct RArray *a)
{
- mrb_int len = ARY_LEN(a);
- struct RArray *d = ary_new_capa(mrb, len);
-
- ary_replace(mrb, d, a);
- return d;
+ return ary_new_from_values(mrb, ARY_LEN(a), ARY_PTR(a));
}
MRB_API mrb_value
