> I have mentioned in previous threads on the subject that julia's 1-indexed arrays don't matter much in practice because the generic APIs hide that fact most of the time.

My guess is that most people who prefer zero-based feel strongly about it, and most people that like one-based don't care that much. If it really doesn't matter that much, I think Julia should've gone with zero. FFTs, Vandermonde matrices (least squares), polynomials, and pretty much anything where the array subscript relates to the mathematics is cleaner with zero-based arrays.