zendframework/zf2 — pull request #3088 by dmitrybelyakov (2012-11-28 13:48:43+00:00)
Title: Zend\Permissions\Rbac roles should inherit parent permissions, not child permissions

As (logically) stated in documentation "Child role will inherit the permissions of their parent." But current implementation defeats the main purpose on role inheritance, as parent roles will inherit all permissions of their children.

It really should be otherwise :)