If my goal was to simply generate an array of unique random numbers, then you are correct and I completely understand, and appreciate, your solution. The memory cost saving ability of shuffle is definitely invaluable. But, that was not my goal. My goal was to benchmark the filtering/processing methods of grep, map, and~~ against the same data set.
Can you see where I did not think your results directly related to the other results? If not, then that's fine.
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