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I miss the days when productivity booster posts were all about REPL, functional programming, composability, immutability.

One of the drawbacks about protocols mentioned in the talk is no longer correct. Protocols can now dispatch on metadata, not just type.

    (defprotocol Dog
      :extend-via-metadata true
      (bark [_]))

Note that "full" solutions are possible in standard OO languages as well (without the usual visitor vs subclasses trade-off): https://news.ycombinator.com/item?id=45210114

Enjoyed this demonstration as well: https://max.computer/blog/solving-the-expression-problem-in-...