def good_decorator(decorator):
    """This decorator makes decorators behave well wrt to decorated
    functions names, doc, etc.""" 
    def new_decorator(f):
        g = decorator(f)
        g.__name__ = f.__name__
        g.__doc__ = f.__doc__
        g.__dict__.update(f.__dict__)
        return g
        
    new_decorator.__name__ = decorator.__name__
    new_decorator.__doc__ = decorator.__doc__
    new_decorator.__dict__.update(decorator.__dict__)

    return new_decorator