x <- c(1, 2, tagged_na("a"), 1, tagged_na("z"), 2, tagged_na("a"), NA)
x %>% print_tagged_na()
unique(x) %>% print_tagged_na()
unique_tagged_na(x) %>% print_tagged_na()
duplicated(x)
duplicated_tagged_na(x)
order(x)
order_tagged_na(x)
sort(x, na.last = TRUE) %>% print_tagged_na()
sort_tagged_na(x) %>% print_tagged_na()
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