The following code fails on a 64 bit machine.

    __gproperties__ = {
        'size'      : (int, None, None,
                       0, sys.maxint, STANDARD_SIZE,
                       gobject.PARAM_READWRITE)
    }

The error is:

"/home/ryan/srctrees/sugar-jhbuild/build/lib/python2.4/site-packages/sugar/graphics/iconbutton.py", 
line 34, in ?
    class IconButton(CanvasIcon, hippo.CanvasItem):
  File 
"/home/ryan/srctrees/sugar-jhbuild/build/lib/python2.4/site-packages/gtk-2.0/gobject/__init__.py", 
line 37, in __init__
    cls._type_register(cls.__dict__)
  File 
"/home/ryan/srctrees/sugar-jhbuild/build/lib/python2.4/site-packages/gtk-2.0/gobject/__init__.py", 
line 49, in _type_register
    type_register(cls, namespace.get('__gtype_name__'))
OverflowError: signed integer is greater than maximum (while registering 
property 'size' for GType 'SugarIconButton')

Afaict in pyg_type_from_object we are mapping python int to GValue int. Since python integers are implemented using long in C, I'd have expected them to be mapped to GValue long.

I might be missing something, please enlighten me :)