#' @param safe_mode [\code{logical(1)}]\cr
#' Default value is \code{FALSE}. When turned on, safe mode guarantees that
#' \code{NA} appears within a sequence if and only if input sequence contains
#' value passed with \code{NA_letter}. This means that resulting type might be
#' different to the one passed as argument, if there are letters in a sequence
#' that does not appear in the original alphabet.
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