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floats are an imperfect representation of real numbers and as such, there are an infinite count of real numbers that cannot be accurately represented with floats (and doubles).

It gets even worse when you start doing calculations on floats/doubles.

These inaccuracies are ok for a lot of things. graphics often uses floats and the errors are small enough they don't matter.

But currency absolutely needs to be accurate, and for that reason, floats/doubles are in appropriate.