[Haskell-cafe] What is a safe Haskell data type to store and manipulate Money values?

[Saurabh Nanda]

>
>
> This is the most important advice: You'll probably run into legal trouble
> if you choose e.g. the wrong rounding mode, and for a good reason: If you
> handle millions of transactions in your system and sneakily always round
> cents "into your own pocket", you'll be a rich man. That's the reason
> behind the tons of rounding modes in e.g. http://docs.oracle.com/javase/
> 8/docs/api/java/math/BigDecimal.html. Ask your local lawyer which is the
> right one. ;-) I have serious doubts that you can handle such things with a
> floating point representation.
>

That's an important point you raise.

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)?

-- Saurabh.
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