| F | ↗ | D | WC_Abstract_Order improved |
| ⇢ | A | WC_Abstract_Legacy_Order::add_coupon() added | |
| ⇢ | A | WC_Abstract_Legacy_Order::add_tax() added | |
| ⇢ | A | WC_Abstract_Legacy_Order::add_shipping() added | |
| ⇢ | A | WC_Abstract_Legacy_Order::add_fee() added | |
| ⇢ | A | WC_Order_Item_Shipping::set_shipping_rate() added | |
| ⇢ | A | WC_Order_Item_Tax::set_rate() added | |
| C | ↘ | D | wc-admin-functions.php ➔ wc_save_order_items() got worse |
| A | ↘ | B | WC_AJAX::add_order_tax() got worse |
| B | ↗ | A | WC_AJAX::add_order_fee() improved |
| F | ↗ | B | WC_AJAX::calc_line_taxes() improved |
| B | ↛ | WC_Abstract_Order::add_tax() removed | |
| A | ↛ | WC_Abstract_Order::add_coupon() removed | |
| A | ↛ | WC_Abstract_Order::add_shipping() removed | |
| A | ↛ | WC_Abstract_Order::add_fee() removed |