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in ClojureScript by

Entering a set literal in the REPL with more than 8 elements should create a PHM backed set but instead it is array backed.

Example (in REPL):
cljs.user=> (type (.-hash-map #{1 2 3 4 5 6 7 8 9}))

This means operations such as get and contains? end up doing long scans and are slower than a user would expect.

1 Answer

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Reference: https://clojure.atlassian.net/browse/CLJS-1766 (reported by tmulvaney)