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Just curious on why a string in Clojure isn't of type clojure.string, and instead is java.lang.String. It seems a bit odd that I need to require clojure.string to access the native Clojure string functions?

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Because java.lang.String is immutable and doesn't break interoperability with Java. The functions in clojure.string can be mostly considered as a convenience layer on top of already existing functionality in the JDK and/or clojure.core.

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Also worth noting for the asker that clojure.string isn't a type, but a namespace, and java.lang.String is a type contained within java.lang.

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