Subclass Gio.DBusProxy and UnicodeDecodeError under python 3

[infirit <infirit gmail com>]

Hi all,

I subclassed Gio.DBusProxy and overridden the do_g_properties_changed
virtual function. In there I emit my own signal that consumers of the
proxy can connect to. I have created a minimal example of what I am
doing which you can find on [1].

The code from [1] runs perfectly fine under python2.7 with no
UnicodeDecodeError at any point, the situation under Python 3.4 however
is different. See below an example error. I narrowed it down to
overriding do_g_properties_changed, without that the error goes away.

  *connected function* /org/bluez/hci0/dev_7C_2F_80_3B_AF_AB RSSI -64
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb8 in position
0: invalid start byte

The strange thing is that it does not generate a traceback so I am not
entirely sure how to proceed with this. It also does not seem to result
in issues however my gut tells me not to ignore it. Anyone know what is
going on with this?

Pygobject version 3.22.0
Python version 3.4
GLib 2.50.2

Thanks
~infirit

[1] https://gist.github.com/infirit/905824891cbca1c9d4fd2edb69817a37