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Yes, it isn't possible for the software to know your local accounting laws and practices.

My point is it's probably better to use existing, well-tested provisions than to build your own from scaled integers, to get one of those three results.

As a bonus, you might get hardware support in the future.

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Yes, I understand what you are saying, I was highlighting that those (if adopted) would only fix (maybe) part of the problem, they are just (better) tools.

At the end of the day what I want (and I presume any other customer wants) is a correct invoice with the correct net, tax and total, and this will only happen when (if) the programmer understands the base issues and uses the correct library/algorithm/whatever.

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