#' is_zero
#'
#' @param zdd a zdd list object
#'
#' @return TRUE if the zdd matches the output of zdd0()
#' @export
#'
#' @examples
#' is_zero(as_zdd(FALSE)) # TRUE
#' is_zero(zdd(0L)) # FALSE
is_zero <- function(zdd) {
return(zdd == zdd0())
}
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