Key-value observing page

@Ryan

Aug '20

I propose an update to the following page:

What is key-value observing? https://www.hackingwithswift.com/example-code/language/what-is-key-value-observing

Where the second code block could read:

var personObserver: NSKeyValueObservation?
personObserver = taylor.observe(\Person.name, options: .new) { person, change in
    print("I'm now called \(person.name)")
}

Like this, the yellow warning disappears and the observer remains in memory (via the reference). ~R

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