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"All of those should be generic, but aren't."

I think even more damning then "these should be generic" is that there should be more of them. The real problem is the lack of generics inhibits the introduction of more data structures because they are hard to use.

It is true that arrays and maps/hashes take you a long way, but there's a lot of other useful data structures in the world. And despite the fact they may look easy at first, data structure code tends to be notoriously difficult to write both correctly and with high performance.

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