This file is indexed.

/usr/lib/R/site-library/base64enc/INDEX is in r-cran-base64enc 0.1-3-1build1.

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

The actual contents of the file can be viewed below.

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base64                  Encode/decode data into/from base64 encoding
checkUTF8               Check the validity of a byte stream ot be
                        interpreted as UTF8.
dataURI                 Create a data URI string