Toot

Written by Jeff Grigg on 2025-01-09 at 00:09

@lispi314 @kelpana @becomethewaifu @jeremiah

Java BigDecimal can handle it all, precisely, regardless of scale.

But do realize that currency conversion factors are barely good to two decimal places, on a good day.

Rounding is always a critically important business issue.

And so is accumulating currencies for batch conversion to avoid loss.

There are "banker's rounding" tricks (that predate computers) to ensure that the totals, when computed independently, add up exactly.

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