#' @param ahead Vector of (one or more) integers. How many epiweeks/days ahead
#' are you forecasting? If `incidence_period = "epiweek"` and forecast_date is
#' Sunday or Monday, then `ahead = 1` means the epiweek that includes the
#' forecast date; if `forecast_date` falls on a Tuesday through Saturday, then
#' it is the following epiweek. If `incidence_period = "day"`, then `ahead =
#' 1` means the day after forecast date.
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