#' @param mode [\code{character(1)}]\cr
#' Storage mode of the array. Arrays can hold vectors, i.e. \dQuote{logical},
#' \dQuote{integer}, \dQuote{integerish}, \dQuote{double}, \dQuote{numeric}, \dQuote{complex},
#' \dQuote{character} and \dQuote{list}. You can also specify \dQuote{atomic}
#' here to explicitly prohibit lists. Default is \code{NULL} (no check).
#' If all values of \code{x} are missing, this check is skipped.
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