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rounding half up
round(49.5) + round(50.5) 50 + 51
as opposed to banker’s rounding / rounding half to even:
round(49.5) + round(50.5) 50 + 50
there are different methods of rounding, and this one is likely caused by the always round up method when at a .5 value. there are methods that evenly distribute rounding, or at least attempt to.