I’ve stuck it out with Core Data through several projects, but I *never* use 
Core Data’s validation because it usually raises exceptions as objects are 
being constructed, presenting inscrutable errors to the user.  So I can’t 
explain why your validate<Key> is not getting called.  But if you did fix it, 
you probably wouldn’t like the result.

Instead, invoke your validateWhatever with “manual” function calls, at points 
which you deem are appropriate.

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