packages/rehype-sort-attribute-values/index.js
function compare(a, b, index) {
  return (
    (a.charCodeAt(index) || 0) - (b.charCodeAt(index) || 0) ||
    compare(a, b, index + 1)
  )
}
function compare(a, b, index) {
  return (
    (a.charCodeAt(index) || 0) - (b.charCodeAt(index) || 0) ||
    compare(a, b, index + 1)
  )
}
This would create an infinite loop if `a` and `b` could be equal, but the list we operate on only has unique values.