This file is indexed.

/usr/lib/R/site-library/futile.options/INDEX is in r-cran-futile.options 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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OptionsManager          Futile options management
futile.options-package
                        A scoped options management framework