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But the problem is that C fundamentally limits reusability! I have great respect for you and redis, but your examples are telling: they deal only with strings. With Rust or C++ you can have an extremely efficient, well tested, robust generic map structure that will accept any key or value types. C simply cannot do that, because of the language's limitations, not just its stdlib.

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But C can be improved by adding features that allow this and there is a lot of CS experience accumulated around metaprogramming to design this without lots of pitfalls, and no one says that this is easy, this is really hard, but possible. Unfortunately, the committee plays with old and ugly macros system and a little bit with lambda which for sure is better than nothing, but not enough to make C better.

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