(array length=length) and (out caller-allocates) not handled properly for return values
Submitted by Andy Holmes
Calling GData.ContactsContact.get_photo() always results in the error:
Gjs-Message: JS ERROR: Unsupported type guint64 for (out caller-allocates)
I posted a related question on SO: https://stackoverflow.com/q/45227317/1108697
As I understand it there is an annotation error in the GIR for this package.