This file is indexed.

/usr/lib/R/site-library/fastmatch/INDEX is in r-cran-fastmatch 1.1-0-1.

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

The actual contents of the file can be viewed below.

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coalesce                Create an index that groups unique values
                        together
ctapply                 Fast tapply() replacement functions
fmatch                  Fast match() replacement