This file is indexed.

/usr/lib/R/site-library/mime/INDEX is in r-cran-mime 0.5-1build1.

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

The actual contents of the file can be viewed below.

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guess_type              Guess the MIME types from filenames
mimemap                 Tables for mapping filename extensions to MIME
                        types
parse_multipart         Parse multipart form data