No idea the performance characteristics of this, but after reviewing the Array methods and coming up empty, I attempted this just out of curiosity. (The single pop gets rid of the trailing nil)
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Ah, I forgot up that - thank you! You can further optimize it by using a constant empty array and doing `array[from, size] = EMPTY_ARRAY`. I did a benchmark comparing pop, slice! and your method using benchmark-driver. Interestingly pop was faster even though it creates arrays.
didn't look at the comments, but did almost the same, lol