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Clojure allows one to start with essentially untyped code, then add type declarations for efficiency and safety.

• kyllo 7y ago
  core.typed never really caught on though, what seems more popular is Schema which focuses on annotating and validating the structure of lists and maps: https://github.com/plumatic/schema https://github.com/plumatic/schema
  • Scarbutt 7y ago
    And Schema died in favor of Spec, which is still in flux.
    • cutler 7y ago
      Spec isn't finalised but I wouldn't say it's in flux. It's 95% there.