Either suppress the entry entirely, or not at all. But do not suppress the "localhost" names we recognize, leaving the ones we do not in place. On Fedora, where "localhost4.localdomain4" is among those listed in /etc/hosts for 127.0.0.1 we'd thus otherwise drop the "localhost" but keep the "localhost4.localdomain4" and then on reverse lookups only return that, which is highly confusing.
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