[PyQt] Mac does not pass back QIcon from data() method in a model/view

[bvz]

I have just noticed this little oddity:

I have a data() method inside a QAbstractTableModel subclass.  This method
is supposed to pass back an icon for a QTableView to display when the role
Qt.DecorationRole is used.

On the Mac it will only return the icon if I use:
return QtGui.QIcon(paramObj.get_icon())

On Linux, it will only work if I use:
return QtCore.QVariant(paramObj.get_icon())

Am I doing something wrong, or is this just a little weirdness that I should
code around?

Here is the actual code, currently set up to run on my Mac:

    def data(self, index, role=QtCore.Qt.DisplayRole):
        """
        Returns the text or formatting for a particular cell, depending on
the 
        role supplied.
        """
        if not index.isValid() or not (0 <= index.row() < self.rowCount()):
            return QtCore.QVariant()
        
        #get the light, and from that, get the parameter requested
        lightObj = self.get_light_at_index(index.row())
        paramObj = self.get_parameter_at_index(lightObj, index.column())

        if role == QtCore.Qt.DisplayRole:
            return QtCore.QVariant(paramObj.get_formatted_display_value())
            
        elif role == QtCore.Qt.TextColorRole:
            return QtCore.QVariant(paramObj.get_text_color())
            
        elif role == QtCore.Qt.TextAlignmentRole:
            return QtCore.QVariant(paramObj.get_text_alignment())
            
        elif role == QtCore.Qt.FontRole:
            return QtCore.QVariant(paramObj.get_text_font())
            
        elif role == QtCore.Qt.DecorationRole:
            return QtGui.QIcon(paramObj.get_icon())
#             return QtCore.QVariant(paramObj.get_icon())

        elif role == QtCore.Qt.BackgroundColorRole:
            return QtCore.QVariant(paramObj.get_cell_color())
            
        return QtCore.QVariant()

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