Note the somewhat disingenuous performance claim: The reimplementation itself is not 1.5x to 18x as fast as the C one. It is calling from Swift that is faster

Note the somewhat disingenuous performance claim: The reimplementation itself is not 1.5x to 18x as fast as the C one. It is calling from Swift that is faster. Yes, they correct in the parenthesis, but that's not how parenthetical expressions work: A parenthetical expression is extra information added to a sentence or question that clarifies, explains, or adds information without changing the basic meaning. Think of it as an aside providing readers with helpful information that they don’t absolutely have to have, but that is helpful to them. https://grammar.yourdictionary.com/style-and-usage/parenthetical-expression-types-and-usage.html https://grammar.yourdictionary.com/style-and-usage/parenthet... So basically, they are fixing the problem they've been having with bridging performance, which of course is due purely to them mis-designing Swift in such a way that it doesn't bridge well with all the existing code they have.