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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
gradual typing (spec/schema/malli) or actual type systems like https://github.com/clojure/core.typed . I don't use them too much though.
Or make the change, test at the repl, and trace through isolated functions to ensure things look good. Clojure is still strongly typed, some classes of mismatches will trigger on code paths at runtime (typically class cast exceptions; NPEs might trigger due to nil punning being a common idiom). This requires exercising the system though, so regression tests (and ideally generative / property based testing https://github.com/clojure/test.check) can help suss out problems a-priori.