gobject: improved checks in initialize-instance for gobject meta-class
drwxr-xr-x - doc
drwxr-xr-x - gdk
-rw-r--r-- 14048 generating.lisp
drwxr-xr-x - glib
drwxr-xr-x - gtk
-rw-r--r-- 16740 subclass.lisp
-rw-r--r-- 11889 subtest.lisp