zendframework/zf2 — pull request #1388 by prolic (2012-05-28 13:22:23+00:00)
Title: Zend\Stdlib\Hydator\HydratorInterface::hydrate() returns object

Currently for the implementations we provide, it's not needed, but in case you want a doctrine\hydrator (f.e. https://github.com/prolic/HumusDoctrineHydrator), the object must be returned by that method, because it could be, that a new object instance will be created by doctrine, because it get's loaded from database, so finally it's a needed change and the api is also cleaner, imo