shiboken.wrapInstance returns the type of object passed whereas sip.wrapinstance returns the best possible match

Inside maya we use sip to get python objects for maya ui elements like the main window. What is great is I don't have to tell it every time what kind of object I want back and I get the best match (A QtGui.QMainWindow in this case). Which I can then pass as a parent to other calls.

However with PySide it returns exactly what we pass and nothing better, which requires us to pass the specific thing we want each time. Not a big deal but certainly less awesome.

>>> import sip
>>> from PyQt4 import QtCore as PyQt_QtCore
>>> from PyQt4 import QtGui as PyQt_QtGui
>>> import shiboken
>>> from PySide import QtCore, QtGui
>>>
>>> ptr = apiUI.MQtUtil.mainWindow()
>>> print sip.wrapinstance(long(ptr), PyQt_QtCore.QObject)
<PyQt4.QtGui.QMainWindow object at 0x000000002F6CA840>
>>> print shiboken.wrapInstance(long(ptr), QtCore.QObject)
<PySide.QtCore.QObject object at 0x000000002F7765C8>