Unexpected output

Running `(type (conj [1 2 3] 4))` in the REPL prints:

```
[12]> (type (conj [1 2 3] 4))
<
fn *anonymous*
[a b c d e f]
```

If I retry that on https://clojurescript.io/
the result is:

```
cljs.user=> (type (conj [1 2 3] 4))
cljs.core/PersistentVector
```