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Calling a non-callable raised an OCaml-level Eval_error "Not callable" that JS try/catch couldn't intercept. Added a (js-function? callable) precheck in js-apply-fn that raises a TypeError instance via (js-new-call TypeError (list msg)) so e instanceof TypeError is true. Same swap for the undefined() branch in js-call-plain (was raising a bare string). built-ins/String: 71/99 → 73/99 (canonical), 74/99 → 75/99 (isolated). conformance.sh: 148/148.