Finally got it so that Planck shows actual function symbols in stack traces. Previously:
cljs.user=> (ffirst 1)
1 is not ISeqable
cljs$core$seq (cljs/core.cljs:1106:20)
cljs$core$first (cljs/core.cljs:1115:16)
cljs$core$ffirst (cljs/core.cljs:1609:11)
Now:
cljs.user=> (ffirst 1)
1 is not ISeqable
cljs.core/seq (cljs/core.cljs:1106:20)
cljs.core/first (cljs/core.cljs:1115:16)
cljs.core/ffirst (cljs/core.cljs:1609:11)