This file is indexed.

/etc/apt/apt.conf.d/99-localepurge is in localepurge 0.7.3.2.

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

The actual contents of the file can be viewed below.

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// Get rid of unneeded locale files after each package installation

DPkg
{
Post-Invoke {"if [ -x /usr/sbin/localepurge ] && [ $(ps w -p $PPID | egrep -c '(remove|purge)') != 1 ]; then /usr/sbin/localepurge; else exit 0; fi";};
};