This file is indexed.

/usr/share/doc/postgresql-doc-9.6/contrib/README.pgc_casts is in postgresql-comparator 2.2.6-3.

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

The actual contents of the file can be viewed below.

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provide useful casts for pg_comparator:
 - bytea to/from bit & varbit,
 - bit & varbit to int2.

load with:

	sh> psql < <path-to-postgresql>/share/contrib/pgc_casts.sql