It appears that calling -setValue:forKey: on an object bypasses or ignores any 
invocation forwarding it has set up, unless I'm missing some obvious error.

I have an object that acts as a wrapper for another object, and so that the 
wrapper can, under some circumstances, act as the thing it is wrapping, it 
implements invocation forwarding using the 'classic' approach of overriding 
-respondsToSelector:, -methodSignatureForSelector: and -forwardInvocation: but 
when I call -setValue:forKey: on the wrapper (where key is implemented by the 
thing wrapped), it throws the 'not key-value coding compliant for key' 
exception. The stack trace appears to show that this failure occurs before it 
has even attempted to follow the forwarded path. However if I simply call the 
wrapped property setter directly, the forwarding works. As this needs to work 
on 10.5, I can't use the 10.6 solution of -forwardingTargetForSelector: (not 
that I've tested it to see if it exhibits the same issue or not). 

Is this the expected behaviour?

--Graham


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