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That's true - the problem is actually exacerbated mathematically because operations aren't over Z or R, but over some arbitrary degree of fixed-point precision. (It's arbitrary because currency-exchange rates, unit-pricing and all that). And that's where the difficulty creeps in!
I think I'm beginning to imagine the amount of work you must have put in at @MYOB...
oh that was the easy part - and I didn't have to do all of it - there was a team of amazingly astute accountants for BAs, and engineers like @pjbirch and @RussVanBert who basically could write the book about accounting software!
It was a heck of a lot of fun :D
It was fun! Hey, if you ever want to do it again, let me know 
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