In ClojureScript forms can't always be replaced by they macroexpanded forms. This is the case for defrecord and defn on its multi arity version.
clj -Sdeps '{:deps {org.clojure/clojurescript {:mvn/version "1.11.60"}}}' -M -m cljs.main
ClojureScript 1.11.60
cljs.user=> (defrecord ARecord [a])
cljs.user/ARecord
cljs.user=> (macroexpand '(defrecord ARecord [a]))
(let* [] (do (defrecord* ...)))
cljs.user=> (let* [] (do (defrecord* ...)))
WARNING: Wrong number of args (4) passed to ARecord at line 1 <cljs repl>
WARNING: Wrong number of args (4) passed to ARecord at line 1 <cljs repl>
WARNING: Wrong number of args (4) passed to ARecord at line 1 <cljs repl>
WARNING: Wrong number of args (4) passed to ARecord at line 1 <cljs repl>
WARNING: Wrong number of args (4) passed to ARecord at line 1 <cljs repl>
WARNING: Wrong number of args (4) passed to cljs.user/ARecord at line 1 <cljs repl>
WARNING: Wrong number of args (4) passed to cljs.user/ARecord at line 1 <cljs repl>
Same thing happens trying to evaluate the forms resulting from this macroexpansion:
(macroexpand '(defn foo ([a] (foo a 5)) ([a b] (+ a b))))
