This file is indexed.

/usr/lib/R/site-library/tibble/INDEX is in r-cran-tibble 1.4.1-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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add_column              Add columns to a data frame
add_row                 Add rows to a data frame
as_tibble               Coerce lists and matrices to data frames.
enframe                 Converting atomic vectors to data frames, and
                        vice versa
frame_matrix            Row-wise matrix creation
glimpse                 Get a glimpse of your data.
is.tibble               Test if the object is a tibble.
new_tibble              Constructor
rownames                Tools for working with row names
set_tidy_names          Repair object names.
tbl_sum                 Provide a succinct summary of an object
tibble                  Build a data frame or list.
tibble-package          tibble: Simple Data Frames
tribble                 Row-wise tibble creation