Thank you for your response, Marko.
I want to clarify one more thing:

(let [[t d] (split-with #(< % 12) (range 1e8))]
    [(count d) (count t)])


does this mean that while (count d) is realizing (range 1e8) seq, it 
becomes (also) realized within t, therefore 
it doubles (range 1e8) in memory causing OOME while (count d) is still not 
finished?

Also, you say "As *count* realizes one element after another, it doesn't on 
its own retain a reference to the past elements."

Does this mean that, eg. in repl, when I do some (count xyz) and it 
realizes xyz, It will later need to be reevaluated (realized again) if I 
require xyz within repl (I presume that if I require xyz later within file, 
it wont be GC due to it and clojure will know it shouldnt be GC)


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