#' Check if x is a `nex` object
#'
#' @param x `nex` object
#' @examples
#' \dontrun{
#' is.nex(twig)
#' }
#' @export
is.nex <- function(x) {
inherits(x, "nex")
}
# TODO: make as.nex (e.g., for converting from files imported by read.nexus.data, etc.)
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