code: function sortRankedItems(a, b) {
    const aFirst = -1
    const bFirst = 1
    const {rank: aRank, index: aIndex, keyIndex: aKeyIndex} = a
    const {rank: bRank, index: bIndex, keyIndex: bKeyIndex} = b
    const same = aRank === bRank
    if (same) {
      if (aKeyIndex === bKeyIndex) {
        return aIndex < bIndex ? aFirst : bFirst
      } else {
        return aKeyIndex < bKeyIndex ? aFirst : bFirst
      }
    } else {
      return aRank > bRank ? aFirst : bFirst
    }
  }
docs: Sorts items that have a rank, index, and keyIndex
  @param {Object} a - the first item to sort
  @param {Object} b - the second item to sort
  @return {Number} -1 if a should come first, 1 if b should come first
  Note: will never return 0