GHashTable with boxed types values segfaults

I've been playing around with gobject-introspection and pygobject for the last couple of weeks and I have run into my first real problem.

I have a method that returns a newly allocated GHashTable with key-type int and value-type some boxed type I defined. Everything works fine from C, but with pygobject I run into segfaults and weird behavior as soon as I try and get the values from the dictionary in python.

Is this fully supported? I am seeing that several unittests for hash tables are skipped and marked as broken...