I have been hearing a lot of Clojure's use of an internalReduce protocol, 
which seems to speed up things when using reduce.
Now the thing is that a lot of people also claim that tail-call-recursion 
is also pretty fast, which lets me wondering:

- if I could replace a loop/recur with an equivalent reduce/reduced 
approach, do I see performance gains?

Obviously the immediate answer is just "benchmark it", but so far I haven't 
found an stable solution to this question. The benchmark seems to go 
sometimes for loop/recur and some others for reduce/reduced. I also know 
that when doing primitive math, loop/recur performs better than 
reduce/reduced, but I was wondering in which cases (regardless of idiomatic 
or nor) would a reduce approach be preferred over a loop/recur?

Any thoughts on this?

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