I think core.cache release also includes https://clojure.atlassian.net/browse/CCACHE-65, which is already described in changelog under 1.2.next.
Unclear. That ticket is In Progress and only partially fixed as I recall.
The original reported issue is fixed but there's still an edge case where the "miss" fn can be called multiple times (from multiple threads) for a concurrent call on the same key.
Ah, I see, thanks. The partial fix has been released: https://github.com/clojure/core.cache/compare/v1.1.234...v1.2.249