What’s the best way to use Obj-C 2.0 Properties with mutable objects, such as NSMutableArray?

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I ran into the same problem some time ago and found a document on the Apple Developer Connection recommending to provide your own implementation of the setter. Code sample form the linked document:

@interface MyClass : NSObject {
    NSMutableArray *myArray;
}
@property (nonatomic, copy) NSMutableArray *myArray;
@end

@implementation MyClass

@synthesize myArray;

- (void)setMyArray:(NSMutableArray *)newArray {
    if (myArray != newArray) {
        [myArray release];
        myArray = [newArray mutableCopy];
    }
}

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