This file is indexed.

/usr/share/postgresql/10/extension/plperl.control is in postgresql-plperl-10 10.3-1.

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

The actual contents of the file can be viewed below.

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# plperl extension
comment = 'PL/Perl procedural language'
default_version = '1.0'
module_pathname = '$libdir/plperl'
relocatable = false
schema = pg_catalog
superuser = false