Do you ever need to equally compare numbers (floating points)?

I have long known of the existence of https://0.30000000000000004.com -- well, I don't care of bad precision in computerized floating points...

But I have never tried this,

0.1 + 0.2 == 0.3
0.1 + 0.2 - 0.3 == 0.0
0.1 == 0.1 + 1e-26

Now, I know that floating point equality is broken in most programming languages. (I believe Lisp family are exceptions, if you use Fractions).

So, do you ever need to equally compare floating points? If so, what language do you use? And, do you need to write a comparison function, or is there a library for it?

This might be a such comparator,

function eq (a, b, precision = Number.EPSILON) {
  const i = (n) => Math.round(n / precision)
  return i(a - b + 1) === i(1)
}