I like your your solution, I think using `a[0:min(map(len,arrays))]` (ie with 0) is faster because it returns a slice and not a copy of the array. I am glad yo

I like your your solution, I think using `a[0:min(map(len,arrays))]` (ie with 0) is faster because it returns a slice and not a copy of the array. I am glad you liked the trick!