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The fact this won't type check is unbelievably cool
(ns typed-play.core
(:require-macros [cljs.core.typed :as t])
(:require [cljs.core.typed :as t]))
(t/ann my-identity (All [x] (Fn [x -> x])))
(defn my-identity [x]
(if (number? x)
(inc x)
x))
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