bhb

Clojure 1.9.0
user=> (def ^:dynamic *x* "foo")
#'user/*x*
user=> *x*
"foo"
user=>  ;; binding changes value
user=> (binding [*x* "bar"] *x*)
"bar"
user=>  ;; using set! within binding changes value
user=> (binding [*x* "bar"] (set! *x* "bar") *x*)