cache refactoring: Add comments to arg cache setup functions
cache refactoring: Add comments to arg cache setup functions

https://bugzilla.gnome.org/show_bug.cgi?id=709700

pexip/pygobject,sfeltman/pygobject,GNOME/pygobject,sfeltman/pygobject,davibe/pygobject,davibe/pygobject,davibe/pygobject,pexip/pygobject,pexip/pygobject,GNOME/pygobject,davibe/pygobject,GNOME/pygobject,sfeltman/pygobject