#' @param is_method The importance sampling method to use. The following methods
#' are implemented:
#' * [`"psis"`][psis]: Pareto-Smoothed Importance Sampling (PSIS). Default method.
#' * [`"tis"`][tis]: Truncated Importance Sampling (TIS) with truncation at
#' `sqrt(S)`, where `S` is the number of posterior draws.
#' * [`"sis"`][sis]: Standard Importance Sampling (SIS).
#'
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