On 4 April 2017 at 15:50, Joachim Durchholz
Am 04.04.2017 um 16:13 schrieb ALeX Kazik:
Leaving aside the legal aspects of this, what would be Haskell's
equivalent of the BigDecimal format in Java (or Ruby)? Decimal (as used by hledger)?
Rational?
You'd be constantly be doing explicit calculations to get back to a denominator of 100. Plus you'd have to deal with those cases where the denominator is a divisor of 100, and you'd need explicit nonstandard conversion to strings.
The same sort of fiddling-the-denominator problems also occur if you use `Decimal` - it's not normally useful to be able to represent things smaller than £0.01 (or whatever the smallest unit of your local currency is); I'd even go as far as to say it's useful to be able to be sure that you _can't_ represent such things (in the domain of basic accounting at least - more complex things may deal with smaller fractions of currency, so YMMV etc). Cheers,
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