#' @param .by The column name(s) in `data` used to be grouped by. If set to
#' `NULL` (default), all data will be treated as from one subject and there
#' will be no grouping columns in the value returned.
#' @param .input,.extra Each is a [list()] containing all the input variable
#' names and special values for certain variables. See more in the details
#' section.
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