> native functions often have to cover complicated edge cases from the ECMAScript specification, which put them at a performance disadvantage.
Aren't these opposing statements?
function add (a, b) {
return a + b;
}
int add(int a,int b)
{
return a + b;
}
The latter sentence you quoted refers to the specific builtin functions that fast.js re-implements. So we first get close to native performance in JS, then we beat the builtin functions by doing less work overall.