| D | ↘ | F | WC_Checkout got worse |
| ⇢ | D | WC_Checkout::update_customer_data() added | |
| ⇢ | C | WC_Abstract_Order::save_items() added | |
| ⇢ | C | WC_Abstract_Order::add_item() added | |
| ⇢ | A | WC_Abstract_Order::get_items_from_db() added | |
| ⇢ | A | wc-core-functions.php ➔ wc_get_user_agent() added | |
| D | ↗ | C | wc-core-functions.php ➔ wc_get_customer_default_lo... improved |
| A | ↘ | B | WC_Abstract_Order::get_items() got worse |
| C | ↗ | B | WC_AJAX::add_order_item() improved |