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The docstring for scalb links to the documentation for nextDown, presumably just a mistake.
scalb
nextDown
It links here: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#nextDown-double-
But should link here: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#scalb-double-int-
Jira and patch logged at: https://clojure.atlassian.net/browse/CLJ-2811