2.52.0 (stable):

Gio:
* UnixSocketAddress::create(): Remove the default value for the type
  parameter to avoid ambiguity.
  (Kjell Ahlstedt) Bug #782592

Gio::DBus
* Proxy: Wrap call() and call_sync() methods.
  (Vyacheslav Yurkov) Bug #781818

Documentation:
* RefPtr: Clarify comment about undefined behaviour.
  (Daniel Boles)