I don't see anything in the source that might be causing this, e.g. there is one hsplit, but I don't see where in the test function an array_split would be used ...

array_split does not preserve dtype of original array when subarray length is 0. (Trac #2156) #612 Closed #4102 ...

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Python is convenient and flexible, yet notably slower than other languages for raw computational speed. The Python ecosystem has compensated with tools that make crunching numbers at scale in Python ...