@stloyd All I know is I get Warning: spl_object_hash() expects parameter 1 to be object, integer given in vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php line 1375` when I try to update product after installing your code.

https://travis-ci.org/Sylius/Sylius/jobs/21307334 `Scenario: Selecting the product tax category` scenario.