#' @details When the modeling was performed with `na.action = "na.omit"`
#' (as is the typical default), rows with NA in the initial data are omitted
#' entirely from the augmented data frame. When the modeling was performed
#' with `na.action = "na.exclude"`, one should provide the original data
#' as a second argument, at which point the augmented data will contain those
#' rows (typically with NAs in place of the new columns). If the original data
#' is not provided to [augment()] and `na.action = "na.exclude"`, a
#' warning is raised and the incomplete rows are dropped.
#'
#' @seealso [stats::na.action]
#' @md
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