Hello
I am having a weird problem.
I have a slider and a textfield with number formatter, both bound to a
NSUserDefaultsController's "values" controller key and the "someVal"
property.

I am also registering for notifications in the -viewDidLoad of the view
controller:

[[NSUserDefaults standardUserDefaults] addObserver:self forKeyPath:
@"someVal" options:0 context:nil];


The problem is that observeValueForKeyPath is being called twice every time
 I move the slider or enter a new value in the edit.


The viewDidLoad is executed only once (checked with an NSLog).


It is easily reproducible.

Why this might happen?

macOS Sierra.
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