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test zero to 8 instead of 10 places, workaround for rounding error affecting a real-world transaction
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@ -150,7 +150,8 @@ isZeroAmount = null . filter (`elem` "123456789") . showAmountWithoutPrice
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-- | Is this amount "really" zero, regardless of the display precision ?
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-- Since we are using floating point, for now just test to some high precision.
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isReallyZeroAmount :: Amount -> Bool
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isReallyZeroAmount = null . filter (`elem` "123456789") . printf "%.10f" . quantity
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isReallyZeroAmount = null . filter (`elem` "123456789") . printf ("%."++show zeroprecision++"f") . quantity
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where zeroprecision = 8
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-- | Access a mixed amount's components.
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amounts :: MixedAmount -> [Amount]
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