Look everybody, buried in a technical post on Signal's blog:
> It lays the groundwork for the introduction of usernames and phone number privacy which will offer new privacy controls around your phone number’s visibility on Signal.
Presumably, because a technical post also demonstrates how it's not a simple switch to flick, especially when trying to do it in a privacy-preserving way.
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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