On May 10, 2016, at 16:22 , Carl Hoefs <newsli...@autonomy.caltech.edu> wrote:
> 
> I will set 'context' and use it in my check instead.

Yup, use the context to decide whether to call super *and return* but nothing 
else. Once you get past that check, don’t call super.

>  It appears that for some odd reason, once in a blue moon, 'object' and 
> 'keyPath' aren't what they're supposed to be,

It’s not odd, if they’re the object and keyPath of a different observation 
registered by a superclass of your class. You’ve proved it happens!

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