I'm wondering whether (apply concat ...) can be re-written to be
lazy.
...

-----Behavior in 1.1.0------
The operation is eager.

It's not: it simply uses chunked sequences, so the first 32 elements are evaluated together.

user=> (def temp (for [i (range 50)]
           (do (println i)
               [i i i])))
#'user/temp
user=>
user=> (def temp2 (apply concat temp))
0
1
2
...
30
31

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