Are all weak references nilled if we enable zombie object?

Question

Normally, if an object deallocated, all weak references will be nilled.

What about if we enable zombie object?

Product -> Edit Scheme -> Enable Zombie Object

Answer 1

The weak reference will be set to nil even if you enable Zombie Objects.

I tested it like this:

id __weak o;
@autoreleasepool {
    id ob = [[NSObject alloc] init];
    o = ob;
    NSLog(@"Weak ref before release %@", o);
}
NSLog(@"Weak ref after release %@", o);

With Zombies enabled or not, the same output happens:

2013-12-05 23:55:35.571 WeakPointers[93840:303] Weak ref before release  
2013-12-05 23:55:35.572 WeakPointers[93840:303] Weak ref after release (null)