This file is indexed.

/usr/lib/R/site-library/int64/INDEX is in r-cran-int64 1.1.2-3.

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

The actual contents of the file can be viewed below.

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as.int64                Convert character or integer vectors into int64
                        vectors.
as.uint64               Convert character or integer vectors into
                        uint64 vectors.
binary-class            Class '"binary"'
binary-methods          Get binary representation
int64                   Creates new int64 vectors of a given length
int64-class             Class '"int64"'
int64-package           64 bit integer types
numeric_limits          Give numeric limits of integer types
sort-methods            Sorting 64 bits integer vector
uint64                  Creates new uint64 vectors of a given length
uint64-class            Class '"uint64"'
unique-methods          Unique implementation for 64 bit integer
                        vectors