gistfile1

diff --git a/Foundation/CPKeyValueObserving.j b/Foundation/CPKeyValueObserving.j
index b88f766..10e6dd5 100644
--- a/Foundation/CPKeyValueObserving.j
+++ b/Foundation/CPKeyValueObserving.j
@@ -486,6 +486,8 @@ var kvoNewAndOld = CPKeyValueObservingOptionNew|CPKeyValueObservingOptionOld,
     var changeOptions = [CPDictionary dictionaryWithObject:CPKeyValueChangeSetting forKey:CPKeyValueChangeKindKey];
 
     [[_CPKVOProxy proxyForObject:self] _sendNotificationsForKey:aKey changeOptions:changeOptions isBefore:YES];
+
+    [super willChangeValueForKey:aKey];
 }
 
 - (void)didChangeValueForKey:(CPString)aKey
@@ -494,6 +496,8 @@ var kvoNewAndOld = CPKeyValueObservingOptionNew|CPKeyValueObservingOptionOld,
         return;
 
     [[_CPKVOProxy proxyForObject:self] _sendNotificationsForKey:aKey changeOptions:nil isBefore:NO];
+
+    [super didChangeValueForKey:aKey];
 }
 
 - (void)willChange:(CPKeyValueChange)change valuesAtIndexes:(CPIndexSet)indexes forKey:(CPString)aKey
@@ -504,6 +508,8 @@ var kvoNewAndOld = CPKeyValueObservingOptionNew|CPKeyValueObservingOptionOld,
     var changeOptions = [CPDictionary dictionaryWithObjects:[change, indexes] forKeys:[CPKeyValueChangeKindKey, CPKeyValueChangeIndexesKey]];
     
     [[_CPKVOProxy proxyForObject:self] _sendNotificationsForKey:aKey changeOptions:changeOptions isBefore:YES];
+
+    [super willChange:change valuesAtIndexes:indexes forKey:aKey];
 }
 
 - (void)didChange:(CPKeyValueChange)change valuesAtIndexes:(CPIndexSet)indexes forKey:(CPString)aKey
@@ -512,6 +518,8 @@ var kvoNewAndOld = CPKeyValueObservingOptionNew|CPKeyValueObservingOptionOld,
         return;
 
     [[_CPKVOProxy proxyForObject:self] _sendNotificationsForKey:aKey changeOptions:nil isBefore:NO];
+
+    [super didChange:change valuesAtIndexes:indexes forKey:aKey];
 }
 
 - (Class)class