Also from that post:
> Usernames have been one of the most requested features throughout Signal’s existence. Making usernames and phone number privacy a reality in Signal is a massive technical undertaking. It’s something we’ve been working on for a long time and will continue to work on for several more months or longer before it’s ready.
With a link to a code dump from five days ago: https://github.com/signalapp/ContactDiscoveryService-Icelake
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