Nothing
#' @rdname key_and_value
#' @export
as.key <- function(x){
if (!is.atomic(x))
stop("cannot coerce class ", deparse(class(x)), " to a key object")
# We have the same requirements for key as for values but
# the key must also be unique and coerced to character.
x <- as.value(as.character(x))
if (anyDuplicated(x) != 0) stop("All keys must be unique!")
structure(x, class = unique(c("key", class(x))))
}
#' @rdname key_and_value
#' @export
is.key <- function(x){
inherits(x, "key")
}
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