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decodeObjectWithKey: results in high retain counts
@interface Car : NSObject <NSCoding>
@property (nonatomic, retain) NSString * carName;
@property (nonatomic, retain) UIColor *color;
@end


@implementation Car
@synthesize carName, color;

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super init];
    if (self) {
        NSLog(@"%d", color.retainCount); // prints 0

        carName = [[aDecoder decodeObjectForKey:@"carName"] retain];
        color = [[aDecoder decodeObjectForKey:@"color"] retain];

        NSLog(@"%d", color.retainCount); // prints 4
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:carName forKey:@"carName"];
    [aCoder encodeObject:color forKey:@"color"];
}

-(void) dealloc {
    [carName release];
    [color release];
    [super dealloc];
}

@end