This file is indexed.

/usr/lib/R/site-library/memoise/INDEX is in r-cran-memoise 1.0.0-1.

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

The actual contents of the file can be viewed below.

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forget                  Forget past results. Resets the cache of a
                        memoised function.
has_cache               Test whether a memoised function has been
                        cached for particular arguments.
is.memoised             Test whether a function is a memoised copy.
                        Memoised copies of functions carry an attribute
                        'memoised = TRUE', which is.memoised() tests
                        for.
memoise                 Memoise a function.
timeout                 Return a new number after a given number of
                        seconds