This file is indexed.

/usr/lib/R/site-library/rjson/INDEX is in r-cran-rjson 0.2.15-1build1.

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

The actual contents of the file can be viewed below.

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fromJSON                Convert JSON To R
newJSONParser           Convert buffered JSON objects To R
rjson                   JSON for R
toJSON                  Convert R To JSON