Links of interest:
http://stackoverflow.com/questions/4874193/core-data-willsave-method
http://www.cocoabuilder.com/archive/cocoa/134497-coredata-using-willsave-to-update-timestamps-causes-hang.html
https://cocoacasts.com/three-features-of-nsmanagedobject-you-may-not-know-about/

https://developer.apple.com/reference/coredata/nsmanagedobject/1506209-willsave
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CoreData/ObjectValidation.html

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