Ids created with after = TRUE can have pos_id values between x.0 and
x.5 and ids created with after = FALSE can have pos_id values between
1+ x.0 and 1 + x.5 where x is the pos_id integer which was used as a
reference to create the new pos_ids.
validate_new_pos_ids(new_ids, after)A vector with new ids
Whether the ids are created with after = TRUE (and hence
should be in the range x.0-x.45) or not.
Other token creators: create_pos_ids,
  create_tokens