#' @param .before,.after `[integer(1) / Inf]`
#'
#' The number of values before or after the current element to
#' include in the sliding window. Set to `Inf` to select all elements
#' before or after the current element. Negative values are allowed, which
#' allows you to "look forward" from the current element if used as the
#' `.before` value, or "look backwards" if used as `.after`.
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