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#' @title
#' Test if NA
#'
#' @description
#' \code{isNA} tests if an object \code{x} is identical to one of \code{NA},
#' \code{NA_character_}, \code{NA_complex_}, \code{NA_integer_},
#' \code{NA_real_}, or \code{NaN}.
#'
#' @param x
#' An R object.
#'
#' @return
#' \code{TRUE} or \code{FALSE}.
#'
#' @seealso
#' \code{\link{isTRUE}}.
#'
#' @export
#'
isNA <-
function(x)
{
identical(x, NA) ||
identical(x, NA_character_) ||
identical(x, NA_complex_) ||
identical(x, NA_integer_) ||
identical(x, NA_real_) ||
identical(x, NaN)
}
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