#' @return
#' A tibble with class `wt_confint` containing the following columns:
#'
#' * `x` : An ordered sequence of the lifetime characteristic regarding the
#' failed units, starting at `min(x)` and ending up at `max(x)`. With
#' `b_lives = c(0.01, 0.1, 0.5)` the 1%, 10% and 50% quantiles are additionally
#' included in `x`, but only if the specified probabilities are in the range of
#' the estimated probabilities.
#' * `rank` : Interpolated ranks as a function of probabilities, computed with
#' the converted approximation formula of *Benard*.
#' * `prob` : An ordered sequence of probabilities with specified `b_lives`
#' included.
#' * `lower_bound` : Provided, if `bounds` is one of `"two_sided"` or `"lower"`.
#' Lower confidence limits with respect to `direction`, i.e. limits for
#' quantiles or probabilities.
#' * `upper_bound` : Provided, if `bounds` is one of `"two_sided"` or `"upper"`.
#' Upper confidence limits with respect to `direction`, i.e. limits for
#' quantiles or probabilities.
#' * `cdf_estimation_method` : <%=cdf_estimation_method%>
#'
#' @md
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