Comment 2 for bug 1312457

Here's the simplest reproducer:

$ python3
Python 3.4.0 (default, Apr 11 2014, 13:05:11)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from gi.repository import GExiv2
>>> m = GExiv2.Metadata('IMG_2411.JPG')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: GObject.__init__() takes exactly 0 arguments (1 given)

(__init__ is expected to take an argument, but doesn't because the overrides aren't functioning)