This file is indexed.

/usr/lib/R/site-library/abind/INDEX is in r-cran-abind 1.4-3-1.

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

The actual contents of the file can be viewed below.

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abind                   Combine multi-dimensional arrays
acorn                   Return a corner of an array object (like head)
adrop                   Drop dimensions of an array object
afill                   Fill an array with subarrays
asub                    Arbitrary subsetting of array-like objects at
                        specified indices