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    Nice!

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      I agree, although I consider groupBy as an indicator of how well-designed and mature an implementation is.

      I think it is quite interesting to see the spread of such libraries.

      One problem I see is that we are still missing a good word to distinguish between libraries in which xs.map(...).filter(...).sum amounts two three traversals vs. libraries in which it amounts to one.

      “Lazy” doesn’t really feel right.