> Please try writing an ERP system where you have a quantity of a billionth of an item price of a billion euros (or an item price of a billionth Euro and a quan

> Please try writing an ERP system where you have a quantity of a billionth of an item price of a billion euros (or an item price of a billionth Euro and a quantity of billions) and tell me which integer type you deem sufficient for this. For what it's worth, values on the order of 10^18 are exactly representable in int64; decimal64, however, only has 16 significand digits, so there you are already affected by rounding, and it's not far from where the distance between consecutive numbers is greater than 1. In general, with floating points, you either waste lots of space for excessive precision around zero, or you quickly lose precision when numbers grow. On top of that, you get all the other quirks of floating point numbers such as cancellation.