Rightly so, since maps aren’t ordered you should never rely on this

not sure how this relates to the ordering of maps? From the result of the macroexpand, it seems it does not depend on the ordering,

(let*
 [map__155836
  {:a "value-of-a", "value-of-a" :b}
  map__155836
  (if
   (clojure.core/seq? map__155836)
   (if
    (clojure.core/next map__155836)
    (clojure.lang.PersistentArrayMap/createAsIfByAssoc
     (clojure.core/to-array map__155836))
    (if
     (clojure.core/seq map__155836)
     (clojure.core/first map__155836)
     clojure.lang.PersistentArrayMap/EMPTY))
   map__155836)
  a
  (clojure.core/get map__155836 :a)
  va
  (clojure.core/get map__155836 a)]
 va)  

thanks @U04V15CAJ it indeed depends on the ordering!

(let [{va a
            a :a}
           {:a "value-of-a"
            "value-of-a" :b}]
       va) ;; => error

It could also expand to “let [… va (get map_123 a) a (get map_123 :a)]”