code: function updateNewIndicesFromIndex(index, indexDelta) {
                      for (var slot = slotsStart; slot !== slotListEnd; slot = slot.next) {
                          var indexNew = slot.indexNew;
  
                          if (indexNew !== undefined && index <= indexNew) {
                              updateNewIndicesAfterSlot(slot, indexDelta);
                              break;
                          }
                      }
                  }
docs: Updates the new index of the first slot in each sequence after the given new index