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Nice... thanks. But I have to ask: is this really the right
set of metadata to be updating? Here are a few things that
perhaps ought be copied by update_meta:

    f.__name__     (already included)
    f.__doc__      (already included)
    f.__dict__     (already included)
    f.__module__   (probably should include)
    f.func_code.co_filename     (to match f.__name__, but
I'd leave it alone)

there's also the annoying fact that in IDLE (and in some
other python-aware
IDEs) one can see the argument signature for a function as a
"tool tip"
or other hint. Very handy that, but if a decorator is
applied then all
you will see is "func(*args, **kwargs)" which is less than
helpful. I'm
not sure whether this CAN be duplicated... I believe it is
generated by
examining the following:

    f.func_code.co_argcount
    f.func_code.co_varnames
    f.func_code.co_flags & 0x4
    f.func_code.co_flags & 0x8

...and I suspect (experimentation seems to confirm this)
that if you mangle
these then the code object won't work correctly. If anyone's
got a
suggestion for fixing this, I'd love to hear it.