This file is indexed.

/usr/lib/R/site-library/bitops/INDEX is in r-cran-bitops 1.0-6-3.

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

The actual contents of the file can be viewed below.

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bitAnd                  Bitwise And, Or and Xor operations
bitFlip                 Binary Flip (Not) Operator
bitShiftL               Bitwise Shift Operator (to the Left or Right)
cksum                   Compute Check Sum