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並前往https://stackify.dev/362665-why-cant-i-extend-clojures-ifn-using-extend-type

Why can't I extend Clojure's IFn using extend-type? - Stackify

The exception should give you a hint. IFn is not a protocol in Clojure. It is in ClojureScript. You can extend protocols, implement Java interfaces, ...

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