Perhaps they just didn't think about it like you did.
What can you do, why not implement your own method to replace the place insertInManagedObjectContext:and make it call a super-implementation? Create files, then put your new method on ChildEntity.mand get a version of this version. You cannot use the same method name, as it _ChildEntity.mwill have one that does not call the super version. So use a different method name.
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