* Tweak – WooCommerce 9.9 compatibility.

* Update: Allow updating billing info on existing subscriptions when customer changes account details.
* Fix: Use floats instead of integers for tax calculation in subscription switching when prices include tax.
* Fix: Enhance checks in email templates upgrade script for WooCommerce Subscriptions core 8.3.0.
* Dev: Refactor argument processing in run-tests.sh to add a direct check for the -w flag.
* Fix: Undefined array key `new`
* Fix: Ensure subscription exists before updating its last order date.
* Fix: Prevent fatal error when the line items no longer exist in the database.

* Tweak – WooCommerce 9.9 compatibility.

* Tweak – WooCommerce 9.9 compatibility.

* Update: WC and WP version compatibility.
* Update: Internal build scripts update to include version checks.
* Update: Load text domain during the init action to ensure it is available for all actions and filters.