Comments (4)
Well, better than Float, that's true. Depends on the domain of currency supported. Wikipedia says Double is fine up to ~15-17 significant digits, so you can pile up a pretty nice sum of money before it gets problematic.
λ (read "1500000000000.3456") :: Double
1.5000000000003457e12
Feel free to close if not a concern.
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Hi @robinp,
As far as I'm aware of, the lowest subdivision for currencies is 1/1000, which shouldn't be a problem for Double
.
Do you have a specific example that does not work?
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Yes, let's close this for now.
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If you're going to talk about decimal numbers, the Scientific type is generally a much better option than Double, as they're stored as an integer + base 10 exponent already. This is already used in the Aeson library, so doesn't add any actual new deps - there's no reason a tool like this should fail with the above examples
Prelude> import Data.Scientific
Prelude Data.Scientific> (read "1500000000000.3456") :: Double
1.5000000000003457e12
Prelude Data.Scientific> (read "1500000000000.3456") :: Scientific
1.5000000000003456e12
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