Where does an authoritarian source not cause NSUserDefaults to sync for iOS 8 and above?

Question

I remember that you should not worry about calling the NSUserDefaults synchronization method on iOS 8 and above. I also read from one source other than Apple and another allusion to the same. However, I was having trouble finding an authoritative source from Apple. Was this a WWDC video a couple of years ago? What was Apple's reputable source?

Read this: NSUserDefaults and looked at some of them: WWDC 2014 Video

Answer 1

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Answer 2

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