It might help to show the same examples from that module's documentation, how they are similar or different.

I still don't understand this after a skim of your post, since one example has

    @decorator
    def some_decorator(func, args, kwargs):

while the next goes

    @decorator
    def some_decorator(call):

Does this introspect on the parameters of some_decorator?

FWIW I'm happy enough with https://github.com/darius/sketchbook/blob/master/misc/decora...