optional signal parameters added in Qt5 are not supported

# Error: line 1: TypeError: file <maya console> line 29: dataChanged(QModelIndex,QModelIndex,QVector<int>) only accepts 3 arguments, 3 given! # 

from PySide2 import QtGui

def on_data_changed(top_left, bottom_right, roles=None):
   print "Data changed, TL: %s, BR: %s, Roles: %s" % (top_left, bottom_right, roles)

class SignalWrapper(object):
   def __init__(self, signal):
       self._signal = signal
   def emit(self, tl, br):
       self._signal.emit(tl, br, [])
   def __getattr__(self, name):
       return getattr(self._signal, name)

class MyModel(QtGui.QStandardItemModel):
   def __init__(self, parent=None):
       QtGui.QStandardItemModel.__init__(self, parent)
       # adding this line will patch the dataChanged signal to behave like the PySide1 version
       #self.dataChanged = SignalWrapper(self.dataChanged)

   def emit_data_changed(self):
       top_left = self.index(0, 0)
       bottom_right = self.index(0, 0)
       roles = [1,2]

       # this works:
       # self.dataChanged.emit(top_left, bottom_right, roles)

       # this doesn’t unless you uncomment the ‘fix’ in __init__
       self.dataChanged.emit(top_left, bottom_right) # PySide1 version

model = MyModel()
model.dataChanged.connect(on_data_changed)
model.emit_data_changed()