I'm always interested in anything Zach Tellman does, though I don't always 
understand it. 

I see that he defines a function twice, via (let), of which he 
says  "factored out for greater inlining joy". Does anyone know what he 
means by that? Can anyone suggest a reason why this was more convenient 
that writing a macro? And what is the point of the repetition? I feel lost. 


https://github.com/ztellman/manifold/blob/4e1fff70c5380b33e9cc2f50f03ce16af6d393b4/src/manifold/deferred.clj#L705
(let [;; factored out for greater inlining joy subscribe (fn ([this d x] (
let [d (or d (deferred))] (on-realized x #(this d %) #(error! d %)) d)) 
([this d x f] (let [d (or d (deferred))] (on-realized x #(this d % f) #(
error! d %)) d)) ([this d x f g] (let [d (or d (deferred))] (on-realized x 
#(this d % f g) #(error! d %)) d)))]



https://github.com/ztellman/manifold/blob/4e1fff70c5380b33e9cc2f50f03ce16af6d393b4/src/manifold/deferred.clj#L799


(let [;; factored out for greater inlining joy
      subscribe (fn
                  ([this d x]
                     (let [d (or d (deferred))]
                       (on-realized x
                         #(this d %)
                         #(error! d %))
                       d))
                  ([this d x f]
                     (let [d (or d (deferred))]
                       (on-realized x
                         #(this d % f)
                         #(error! d %))
                       d))
                  ([this d x f g]
                     (let [d (or d (deferred))]
                       (on-realized x
                         #(this d % f g)
                         #(error! d %))
                       d)))]









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