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Alex Rivera
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... or alternatively an Array which prevents duplicate entries. Is there some kind of object in Ruby which: responds to [], []= and << silently drops duplicate entries is Enumerable (or at least supports find_all) preserves the order in which entries were inserted ? As far as I can tell, an Array supports points 1, 3 and 4; while a Set supports 1, 2 and 3 (but not 4). And a SortedSet won't do, because my entries don't implement <=>.
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