#' @section Join column:
#'
#' * The one exception to this are `FIRSTONLY` tables. If a table file has the
#' same number of rows as the there are individuals in the input data set
#' (accounting for any filtering of data in the NONMEM control stream), it
#' will assumed to be a `FIRSTONLY` table. In this case, the table will be
#' joined to the input data by the `ID` column. If `ID` is not present in
#' the table, it will be using `.join_col`. Note that if _neither_ `ID` or
#' the column passed to `.join_col` are present in the table, the join will
#' fail.
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