Function firstDiffIndex

scripts/github-actions/check-translation-sync.js:106–110

(a, b)

}

function firstDiffIndex(a, b) {
  const n = Math.min(a.length, b.length);
  for (let i = 0; i < n; i++) if (a[i] !== b[i]) return i;
  return n; // sequences agree up to the shorter one's length
}

function describeHeading(h) {
  if (!h) return "no heading (document ends)";