code: public MappedListIterator<VLinkedPagedKey, LK> listIterator(LK linearKey,
                                                                  boolean next,
                                                                  Integer pageId) {
          return new VLinkedPagedListIterator<I, LK>(_index, _serializer, linearKey, next, pageId);
      }
docs: Similar to listIterator(LK linearKey, boolean next) except with the
  addition of the hint "pageId" which specifies the first page to look for
  the key.
  
  Runtime: up to O(n) gets, unless a good hint page is provided, then it
  could be 1 - 2 gets.
  
  @param linearKey
  @param next
  @param pageId
  @return