What GVariant corresponds to a Python3 int?

[Robert Park <robru gottengeography ca>]

So, I'm just beginning the process of porting my PyGObject application
to Python3. Mostly it's going well (it runs and most features
function), but I'm getting this weird error message:

(gottengeography:9763): GLib-GIO-CRITICAL **: g_settings_bind:
property 'offset' on class 'gg+camera+Camera' has type 'glong' which
is not compatible with type 'i' of key 'offset' on schema
'ca.exolucere.gottengeography.camera'

And here is the related code, which worked perfectly in Python 2.7:

class Camera(GObject.GObject):
    offset = GObject.property(type=int, minimum=-3600, maximum=3600)
    utc_offset = GObject.property(type=int, minimum=-24, maximum=24)
    [...etc...]

So, why are Python3 ints translating into glongs, how is that different
from the behavior in Python 2.7, and what should I do to fix this? For
the purposes of the property I need the number to be an integer. I
tried most other gvariant types in the schemas but nothing seemed
to suppress this error.

Thanks.

-- 
http://gottengeography.ca