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InfluxDB
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I'm talking about the fact that a particular dynamic language has it, whether some people use it or not is moot. https://github.com/typedclojure/typedclojure is the successor to the erstwhile popular core.typed library, and normal Clojure itself allows for type annotations to (potentially) help improve performance.
The issue is due to a core problem in Ruby projects: heavy meta-programming. Some trivial cases can be dealt with, but many are a big challenge. I should know this, because I spent quite some time trying to write a static analysis tool for Ruby back in the day. The conclusion of that project was that I don't hate myself to continue trying to make it work, so I abandoned the project.