I think the easiest answer to that question is that there's rounding happening in almost every step where you do something with them. This also includes parsing

I think the easiest answer to that question is that there's rounding happening in almost every step where you do something with them. This also includes parsing from decimal floats in textual representation and outputting as decimal floats in textual representation. The funny thing is that if you work with decimal floating points you usually don't get any of those effects because you often stay inside the accuracy/precision that the float can hold. Yet they're seen as useless.