https://github.com/sass/sass/blob/main/spec/types/number.md#fuzzy-equality

They are both finite numbers and the mathematical numbers they represent produce the same value when rounded to the nearest 1e⁻¹¹ (with ties away from zero).

In my understanding, "precision of 10" means two internal numbers are considered equal if they are equal after rounding them up to 1e⁻¹⁰, . In other words, with dart-sass being precision of 10, if two SassNumbers serialize to the same String after rounding, they should be equal, however, I discovered that fuzzy equality requires a precision of 11 in spec instead of precision of 10, which leads to a very confusing situation.

https://sass-lang.com/playground/#eJwzNFRJtFIw0DMwNDI2MTUzt7C05lJJQhUxMQWKJcaX5McXWykoV6sk1oLUIPhJQD5XSWpxiUI1l4JCamFpYk5mSaVuYrFucUlRZl66lQJUt4KtrQJUozWayrzS3KTUIpBKiCJrrloAgV8sUQ==

> a = SassNumber(0.0123456789)
0.0123456789
> b = SassNumber(0.012345678945)
0.0123456789
> a.toString() == b.toString()
true
> a.equals(b)
false