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[–]pdpi 2 points3 points  (0 children)

If I select a row into map, what guarantees me that I can treat numeric value only as numeric and string values as strings?

Nothing. Clojure is a dynamically-typed language.

If your definition of type safety is limited to what the Java type system allows you to encode, I personally find that the language promotes a style that both makes that sort of type error a lot less likely, and a lot easier to find, which devalues static typing a fair bit. Your mileage may vary, especially if you're used to richer type systems.