Well, I didn¹t get any response as to how to make that beast ARC compliant, so I did something else. Keeping the same basic undo architecture as used in Sketch, I created my own version of NSMutableDictionary, albeit much simplified, containing only what I needed. Sometimes the standard classes don¹t quite get it. Doing my own, I was able to use the graphic objects as keys, without making copies like NSMutableDictionary does. That worked.
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