#' Is a vector unique?
#'
#' @param .x A vector.
#'
#' @return Logical scalar.
#'
#' @export
#' @import data.table
#' @rdname is.unique
is.unique <- function(.x) {
uniqueN(.x) == length(.x)
}
#' @export
#' @rdname is.unique
is_unique <- is.unique
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