crosstable
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`header_show_n=T` doesn't work if `by=NULL`
crosstable(mtcars) %>% af(header_show_n=T)
crosstable(mtcars, by=am) %>% af(by_header=F, header_show_n=T)
crosstable(mtcars) %>% af(header_show_n=T)
crosstable(mtcars, by=am) %>% af(by_header=F, header_show_n=T)