(this is actually outputting NaNi which I defined to show it as sqrt(abs(num)) if it's NaN but it used i as NaN, making NaNi which shows up as NaNi)
Where did you get this block from?
I made it, and it just does a more accurate square root
correct answer for reference:about 0.707+0.707i or sqrt(1/2)+sqrt(1/2)i