This file is indexed.

/usr/share/debhelper/autoscripts/preinst-ubuntu-defaults-divert is in ubuntu-defaults-builder 0.49.

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

The actual contents of the file can be viewed below.

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if [ "$1" = install -o "$1" = upgrade ]; then
    dpkg-divert --package PACKAGE --rename --divert FILE.ubuntu-defaults --add FILE
fi