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FYI, I'll re-iterate something I said before, there is a different approach you can take here if this is just an issue of proxying. Use two different proxy types depending on if the proxied object is callable or not:
class Proxy:
 # all the proxy stuff...
class CallableProxy(Proxy):
 def __call__(self, *args, **kwargs):
 ...
def proxy(obj):
 if callable(obj):
 return CallableProxy(obj)
 else:
 return Proxy(obj)
If that isn't a viable alternative then please explain your use case in more detail. I'm sure we can find a solution that works for you.