My understanding was that if I pass an eduction to a process using reduce, 
I can save the computer time and space because the per step overhead of 
lazy sequences is gone and also the entire sequence does not have to reside 
in memory at once.

When I time the difference between (apply max (map inc (range 100000))) and 
(apply max (eduction (map inc) (range 100000))), the lazy-seq variant wins.

I'd like to understand why, and when eductions should be used instead.

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