Clojurians Log v2

Yes no ratios, getting ratios to work is a biggish project, since it means adding a tower CLJS, also how not to slow down the reliance of the data structures on 32bit integer ops

What exactly is the difference in the behaviors? FWIW, the web REPL is made with self-hosted CLJS. I assume your tests use regular CLJS.

Ratios are not supported in .cljs and .cljc files/REPL's https://github.com/clojure/clojurescript/blob/v1.12/src/main/clojure/cljs/compiler.cljc#L307-L308

cljs.user=> 1/2
Unexpected error (ExceptionInfo) compiling at (REPL:1).
failed compiling constant: 1/2; clojure.lang.Ratio is not a valid ClojureScript constant.

IIRC it's just a self-hosted version of CLJS and there's nothing special about it. CLJS, when self-hosted, uses a CLJS reader and not a CLJ one - so there can be no errors about clojure.lang.Ratio. Here's how it behaves in a vanilla self-hosted CLJS:

(cljs/eval-str st "1/2"
    nil
    {:eval node-eval
     :context :expr}
    (fn [res]
      (println res)))
{:ns cljs.user, :value 0.5}
nil
cljs.user=>

The culprit is cljs.tools.reader.impl.commons/match-number - it matches against (def ratio-pattern #"([-+]?[0-9]+)/([0-9]+)") and emits a plain division via cljs.tools.reader.impl.commons/match-ratio.