Fix the bound that never shrinks — find the bug

function search(items, target) {
  let low = 0, high = items.length - 1, guard = 0;
  while (low <= high && guard < 20) {
    const mid = (low + high) >>> 1;
    if (items[mid] === target) return mid;
    if (items[mid] < target) low = mid;
    else high = mid - 1;
    guard++;
  }
  return -1;
}
document.querySelector('#out').textContent = "index " + search([1, 3, 5, 7, 9], 9);