Using reduce() with tuples created by zip()

[Philippe Sigaud]

What I'm trying to explain is that reduce takes two arguments: the growing
value and the current front. In your case, the current front is indeed a
2-tuple, but that's an unrelated issue.

You're trying to get:

reduce!( (firstElemOfPair, secondElemOfPair) => ...) (range)

to work, whereas reduce signature is:

reduce!( (onGoingValue, elem) => ...) (range)
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