Lua: Rounding numbers and then truncate

Which is the best efficient way to round up a number and then truncate it (remove decimal places after rounding up)?

for example if decimal is above 0.5 (that is, 0.6, 0.7, and so on), I want to round up and then truncate (case 1). Otherwise, I would like to truncate (case 2)

for example:
232.98266601563 => after rounding and truncate = 233 (case 1)
232.49445450000 => after rounding and truncate = 232 (case 2)
232.50000000000 => after rounding and truncate = 232 (case 2)

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