this post was submitted on 25 Nov 2025
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Did either of those do banker's rounding?
Round is the safest way of using decimals for money as it corrects 10.499999999 (decimal fractions can't be stored precisely in floats as binary can't precisely represent all 2 digit decimals) to 10.50, where floor would take it to 10.49
It is safer to count in cents and have a policy to handle fractions of cents from divisions