Hi List,

In some debugging within takeValueForKey() I want to find out if the key 
already has a value set. If I call valueForKey() or storedValueForKey() and the 
value isn't already set I get infinite recursion as it triggers a fault and 
tries to load with takeValueForKey() and so on.

I am trying to debug where a value is being set to null, but apparently not 
going via validateXXX() or setXXX() methods, so I want to trap the case where 
the takeValueForKey() is passed null when the key value was previously non-null 
and log a stack trace.

Thanks
John
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