public function items($displayCurrency = false)
    {
        $items = $this->items->map->toArray();

        if (! $displayCurrency) {
            return $items->toArray();
        }

        setlocale(LC_MONETARY, config('cart_manager.LC_MONETARY'));

        return $items->map(function ($item) {
            $item['price'] = money_format('%n', $item['price']);

            return $item;
        })->toArray();
    }