protected function get_default_item_props() {
		return (object) array(
			'object'             => null,
			'tax_class'          => '',
			'taxable'            => false,
			'quantity'           => 0,
			'product'            => false,
			'price_includes_tax' => false,
			'subtotal'           => 0,
			'subtotal_tax'       => 0,
			'subtotal_taxes'     => array(),
			'total'              => 0,
			'total_tax'          => 0,
			'taxes'              => array(),
		);
	}