Transaction rollback doesn't work with contact creation (due to ACL TRUNCATE)

CiviCRM supports a system for transaction commits and rollbacks:

http://wiki.civicrm.org/confluence/display/CRMDOC43/Transaction+Reference

However, if a transaction creates a contact using CRM_Contact_BAO_Contact::create(), the transaction will commit prematurely – because it calls CRM_ACL_BAO_Cache::resetCache() which issues the statement "TRUNCATE TABLE civicrm_acl_contact_cache". To properly respect transactions, it should either use "DELETE FROM" or defer the truncation until the transaction completes.

(The relevant TRUNCATE statement dates back to CiviCRM v3.1.)