following a user request https://github.com/inventaire/inventaire/issues/610, it is now possible to use any #unicode letter in usernames 🎉
Spotify has written good stuff about this here: https://engineering.atspotify.com/2013/06/creative-usernames/
@raffomania @publicvoit @inventaire thanks! The current Inventaire implementation wouldn't map "ᴮᴵᴳᴮᴵᴿᴰ" to "BIGBIRD", so both would be valid distinct usernames (the later being considered identical to "bigbird" though). Our normalization is simply a combinations of JS String trim, toLowerCase, and normalize  methods, which, alone and combined, are idempotent AFAICT.
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