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Currently IFn, IDererf etc implemented as interfaces in clojure but these are protocols in clojurescript.
Are there any plans to fix this mismatch?
Clojure's implementation was created long before protocols existed. ClojureScript had the benefit of a lot of hindsight and a different performance profile.
There are no plans to change the current implementation as it would be difficult to do so while maintaining both performance and backwards compatibility for the many external users and implementors of these interfaces.