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(all (K V) (-> (hash-t K V) (-> K V bool-t) (hash-t K V)))
Remove entries for which the predicate returns true.
(hash-reject (@hash 'a 1 'b 2 'x -1 'y -2) (lambda (k v) (int-non-negative? v))) ;; => (@hash 'x -1 'y -2)