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Forwarding to Super

I need to invoke an NSInvocation with the target as the super object of a given object. That is, I need to invoke the super class's implementation.

Can I somehow access the argumentFrame of NSInvocation to get the arguments for the __builtin_apply() function?
I tried doing this by getting the Ivar of the variable, but I only got a bad access when I tried to apply the offset, so
perhaps I am not doing it correctly.

Must I recreate the argumentFrame by parsing the arguments by hand?
Or is there a higher-level way to do it?

Thanks.
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