# rowids for line-style Code vctrs::new_data_frame(list(a = 1:3, b = letters[1:3]), class = c("line_tbl", "tbl")) Output # A data frame: 3 x 2 a b <int> <chr> = = = 1 1 a 2 2 b 3 3 c # roman rowids Code vctrs::new_data_frame(list(a = 1:3, b = letters[1:3]), class = c("roman_tbl", "tbl")) Output # A data frame: 3 x 2 a b <int> <chr> I 1 a II 2 b III 3 c
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