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Yes "user experience" things like that are improving. And StaticCompiler/GPUCompiler is making good progress.

But I see no movement on the deeper problems, like the limitations of the type system (no effort on traits, function types, interfaces, etc).

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I agree progress on the deeper problems is slow, and I also think that it is slow because 90%+ of the issues people have with Julia are "user experience" things (see any of the help forums as well as all of the previous HN discussions). Given a limited amount of resources, it's difficult to justify a deep dive into revamping the type system (AIUI multiple dispatch with complex types + traits is mostly unexplored territory) over improving latency and tooling. That's not to say it shouldn't be done, but in the absence of some significant (financial and development) support behind it I don't think the type system work will be prioritized.

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