This file is indexed.

/usr/lib/R/site-library/quadprog/INDEX is in r-cran-quadprog 1.5-5-1.

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

The actual contents of the file can be viewed below.

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solve.QP                Solve a Quadratic Programming Problem
solve.QP.compact        Solve a Quadratic Programming Problem