code: func (sl *SkipList) InsertAtPosition(position uint64, cmp common.Comparator) {
  	sl.insertAtPosition(position, cmp)
  }
docs: // InsertAtPosition will insert the provided Comparator at the provided position.
  // If position is greater than the length of the skiplist, the Comparator
  // is appended.  This method bypasses order checks and checks for
  // duplicates so use with caution.