Fix copy values

mrbgems/mruby-struct/src/struct.c

@@ -441,7 +441,8 @@ mrb_struct_initialize_withArg(mrb_state *mrb, int argc, mrb_value *argv, mrb_val
   st = (struct RStruct *) mrb_malloc(mrb, sizeof(struct RStruct));
   DATA_PTR(self) = st;
   DATA_TYPE(self) = &mrb_struct_type;
-  st->values = mrb_ary_new_from_values(mrb, argc, argv);
+  st->values = mrb_ary_new_capa(mrb, n);
+  struct_copy(RARRAY_PTR(st->values), argv, argc);
   mrb_iv_set(mrb, self, mrb_intern(mrb, "__values__"), st->values);
 
   return self;