Feed.php
protected function autoSlice()
    {
        $maxItems = $this->get('max_items', 10);
        if (count($this) > $maxItems) {
            $this->items = array_slice(
                $this->items,
                count($this) - $maxItems,
                $maxItems
            );
        }

        return $this;
    }
protected function autoSlice()
    {
        $maxItems = $this->get('max_items', 10);
        if (count($this) > $maxItems) {
            $this->items = array_slice(
                $this->items,
                count($this) - $maxItems,
                $maxItems
            );
        }

        return $this;
    }
Auto slice the items to keep the good number of items
@return Feed