#' @param destdir Optional string indicating the directory in which to store
#' downloaded files. If not supplied, `"."` is used, i.e. the data file
#' is stored in the present working directory.
#'
#' @param destfile Optional string indicating the name of the file.
#' If not supplied, the file name is constructed from the other
#' parameters of the function call, so subsequent calls with the same
#' parameters will yield the same result, thus providing the key
#' to the caching scheme.
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