yeah I noticed that too

I assume because it reads/evals 100/3 which is valid JavaScript

I really thought ratios were supported in ClojureScript

I guess not

judging by https://github.com/clojure/clojurescript/blob/20a6e1fcd8724ad65a3776112dcc7bfd5124a094/src/main/cljs/cljs/pprint.cljs#L1074

Ratio support is one of the ancient tickets: https://dev.clojure.org/jira/browse/CLJS-555

Map entries in ClojureScript support meta, while they don't in Clojure. I suppose this isn't really a defect, per se.

I've drafted some copy explaining the new map entry stuff and added it to the draft news article: https://github.com/clojure/clojurescript-site/pull/156