On Jul 31, 2008, at 8:21 AM, Keary Suska wrote:

If [[ arrayController arrangedObjects] objectAtIndex: i ] I returning an
immutable object, it's because that is what you are putting into
arrayController 's content array. Use mutable dictionaries instead.

I was mistaken, it is mutable.  I was confused because I had tested with

NSLog(@"arranged object class = %@", [rowDict class]);

and got "arranged object class = NSCFDictionary". I thought I would see the word "mutable" there.
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