This is quite helpful, Quincey, but one thing you wrote surprises me:
If you have a simple 'int' property backed by a single 'int' instance variable, changing the variable directly in your class implementation will not generate any KVO notifications. Changing the *property* -- which in that case means calling the setter method -- does generate KVO notifications. Of course, the setter implementation changes the backing variable.
Is that true, even if I write my own setter method (without willChange/ didChange)? If so, where is the notification coming from?
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