iPhoneOS 3.2

I use NSKeyedUnarchiver's unarchiveObjectWithFile: to load a custom object that contains a single large NSData and another much smaller object. The dealloc method in my custom object gets called, the NSData object is released, its retainCount == 1 just before. Physical memory does not decrement by any amount, let alone a fraction of the NSData size, and with repetition memory warnings are reliably generated: I have test until I actually received level 2 warnings. =(

NSString *archivePath = [[[NSBundle mainBundle] pathForResource:@"lingering"]
     ofType:@"data"] retain];
lingeringDataContainer = [[NSKeyedUnarchiver unarchiveObjectWithFile:archivePath] retain];
[archivePath release];
[lingeringDataContainer release];

and now the dealloc....

- (void) dealloc {
   [releasingObject release];
   [lingeringData release]; 
   [super dealloc];
}

Before release:

(gdb) p (int) [(NSData *) lingeringData retainCount]
$1 = 1

After:

(gdb) p (int) [(NSData *) lingeringData retainCount]
Target does not respond to this message selector.