Just a heads up that required constructors aren't getting poisoned in 1.11.57 (but referred constructors are, which is good), so I reopened https://clojure.atlassian.net/jira/software/c/projects/CLJS/issues/CLJS-3377 I hope that's the right thing to do. I dropped a comment on the ticket illustrating the different behavior for required vs referred constructors.

doseq and similar elements are not detected as JavaScript objects over JavaScript arrays: https://clojure.atlassian.net/browse/CLJS-3380