I’m excited to look at this but the comparisons are misleading! E.g., NPY has existed since 2007 (I believe it was the first NumPy RFC) and is exceedingly popular; JSON can, of course, represent multi-dimensional arrays (you can’t get much simpler or readable than [[1, 2], [3, 4]]); I also don’t understand “Pythonic experience” for JSON since dictionaries are so ubiquitous; I could go on …