My app (macOS 12) observes a value in NSUserDefaults.
Starting with macOS 12 observeValueForKeyPath:… is called at the start of the
program, although nothing has changed yet.
When the value actually changes, it is called twice.
Also: NSKeyValueObservingOptionNew or NSKeyValueObservingOptionOld just return
NSNull instead of old or new values.
Any workaround for these multiple (and unnecessary) calls?
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