This file is indexed.

/usr/lib/R/site-library/readxl/INDEX is in r-cran-readxl 1.0.0-2.

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

The actual contents of the file can be viewed below.

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cell-specification      Specify cells for reading
excel_sheets            List all sheets in an excel spreadsheet.
read_excel              Read xls and xlsx files.
readxl_example          Get path to readxl example