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Also that it maintains insertion order (since Ruby 1.9) opens up more use cases.

Do you know any use cases, other than iteration? Would love to know any interesting ones. Thanks!

Yeah, you can use it to implement a simple (but not necessarily very performant) LRU: https://github.com/SamSaffron/lru_redux/blob/037ee594aded597...

Very cool, thanks for sharing!