Unaware of how developers work (2,3,4)

I believe the answer is:

in the dark

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'unaware' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for in the dark that I've seen before include "without being told" , "Lacking information" , "Told nothing" , "Ignorant, unaware" , "Without information" .)

I've seen this clue in The Globe and Mail.

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