zendframework/zf2 — pull request #3041 by necromant2005 (2012-11-21 10:18:22+00:00)
Title: Update library/Zend/Di/Definition/RuntimeDefinition.php

Main trouble: https://bugs.php.net/bug.php?id=50798
Getting Reflection for default value for internal php extension
I caught this in GearmanClient
The best solution is using "isDefaultValueAvailable" method
http://www.php.net/manual/en/reflectionparameter.isdefaultvalueavailable.php