What is the class NSCFNumber in iOS 4.1?

After successfully acquiring a picture from the iPhone camera on iOS 4.1, you can use the key

@"UIImagePickerControllerMediaMetadata"

to return information about the picture. One of the keys in that dictionary is

@"Orientation"

From my experimentation, Portrait and Upside down are 6 and 8 respectively, and the landscapes are 1 and 3. Look at this code:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSDictionary *metaData = [info objectForKey:@"UIImagePickerControllerMediaMetadata"];
    id orientation = [metaData objectForKey:@"Orientation"];
    NSLog(@"Class: %@",[orientation class]);

The NSLog says "Class: NSCFNumber"

I need to compare this object's value to determine how to proceed. Landscape is 1 or 3, portrait is 6 or 8. I'm not sure what to type orientation as or what to call on it. NSNumber and NSInteger always tells me I'm making integers from pointers without casts.

Thanks for your time!