RoundM(10, 3) # Rounds 10 to a nearest multiple of 3 (9)
RoundM(-10, -3) # Rounds -10 to a nearest multiple of -3 (-9)
RoundM(1.3, 0.2) # Rounds 1.3 to a nearest multiple of 0.2 (1.2)
RoundM(5, -2) # Returns an error, because -2 and 5 have different signs
RoundM(c(1.92, 45.38, 0.831125), 0.05, ceiling)
RoundM(c(1.92, 45.38, 0.831125), 0.05, round)
RoundM(c(1.92, 45.38, 0.831125), 0.05, floor)
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