Function arrayEqual

src/diff.js:1092–1098

(a, b)

  }

  function arrayEqual(a, b) {
    if (a.length !== b.length) {
      return false;
    }

    return arrayStartsWith(a, b);
  }
  function arrayStartsWith(array, start) {
    if (start.length > array.length) {
      return false;