* Avoid unnecessary customer ID retrieval.
* Ignore order count when validating customers.
WC_Customer::get_order_count causes a full table scan without cache.
* Don't get customer names from their last order.
WC_Customer::get_last_order has to scan all _customer_user meta rows.
* Add changelog entry.
* Fix changelog.
* Cache customer ID in Order override classes.
* Check all user roles.
Jeff Stieler