/usr/lib/R/site-library/bitops/INDEX is in r-cran-bitops 1.0-6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | 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
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