I wasn't saying you were confused, I was saying I believe I understand how the general confusion around the whole issue arises.
(If decimal floating point had been commonly used instead of binary, the same class of issues would still exist, but I don't think people would be nearly so surprised by them).
If that were true, they wouldn't have defined the equality operators for floating point types. Some numbers are exactly representable and some numbers are not [1]. It's difficult, but you can in fact reason about the exact results of floating point calculations.
https://news.ycombinator.com/item?id=1847462
