Failing to create a user

[greenfork]

Reproduction:

mugs-admin create-universe
mugs-cli --universe=default

Then

Loading and optimizing MUGS.
Authentication for user 'default-user' failed.
Username [default-user]:
No username specified for this server; create a new one?
1. Yes, create a new one.
2. No, log in with an existing user.
Selection: 1
Desired username: def
Desired password: ***
Confirm password: ***
Caught exception in session 1 while processing request 4: Type check failed in assignment to ; expected uint8 but got Int (36)
  in method inflate at /home/grfork/rakudo/share/perl6/site/sources/0D39982E1C94F153C1C14ABBFA3A5290C3882527 (Red::Driver::SQLite) line 179
  in code  at /home/grfork/rakudo/share/perl6/site/sources/683B66E8BD8BDFE2428AE0E7FB97FA5F6D12E7CA (MetamodelX::Red::Model) line 787
  in method new-from-data at /home/grfork/rakudo/share/perl6/site/sources/683B66E8BD8BDFE2428AE0E7FB97FA5F6D12E7CA (MetamodelX::Red::Model) line 772
  in method pull-one at /home/grfork/rakudo/share/perl6/site/sources/482AD4B6866DEADA7EC0C600E692AE296F767E63 (Red::ResultSeq::Iterator) line 33
  in method head at /home/grfork/rakudo/share/perl6/site/sources/65ECE6F77543664E818F5CAD6DF6F578A9E808B5(Red::ResultSeq) line 312
  in method find at /home/grfork/rakudo/share/perl6/site/sources/683B66E8BD8BDFE2428AE0E7FB97FA5F6D12E7CA(MetamodelX::Red::Model) line 746
  in block  at /home/grfork/rakudo/share/perl6/site/sources/683B66E8BD8BDFE2428AE0E7FB97FA5F6D12E7CA (MetamodelX::Red::Model) line 626
  in method create at /home/grfork/rakudo/share/perl6/site/sources/683B66E8BD8BDFE2428AE0E7FB97FA5F6D12E7CA (MetamodelX::Red::Model) line 617
  in method add-credential at /home/grfork/rakudo/share/perl6/site/sources/55DF510CBCB0FB1F1FB16EA34D1CC8014B6C2483 (MUGS::Server::Storage::Driver::Red::SQLite) line 193
  in method create-account-owner at /home/grfork/rakudo/share/perl6/site/sources/7FB90DB38E2DD8A64DD0242056776BF8200C2221 (MUGS::Server) line 891
  in method create-account-owner at /home/grfork/rakudo/share/perl6/site/sources/7FB90DB38E2DD8A64DD0242056776BF8200C2221 (MUGS::Server) line 897
  in block  at /home/grfork/rakudo/share/perl6/site/sources/7FB90DB38E2DD8A64DD0242056776BF8200C2221 (MUGS::Server) line 684
  in method handle-client-message at /home/grfork/rakudo/share/perl6/site/sources/7FB90DB38E2DD8A64DD0242056776BF8200C2221 (MUGS::Server) line 662
  in block  at /home/grfork/rakudo/share/perl6/site/sources/7FB90DB38E2DD8A64DD0242056776BF8200C2221 (MUGS::Server) line 567
  in method send-to-server at /home/grfork/rakudo/share/perl6/site/sources/7D870C739FE39C858686E4BD422DC5D501594526 (MUGS::Server::Connection::Supplier) line 33
  in method send-to-server at /home/grfork/rakudo/share/perl6/site/sources/AE03EE97C71CE698F33A8FFC0A9033BF9CD8D836 (MUGS::Client::Connection::Supplier) line 45
  in method send-request at /home/grfork/rakudo/share/perl6/site/sources/41086D8434573AB5F5DAFCD0E672692B5F0D52B4 (MUGS::Client) line 459
  in method send-out-of-game-request at /home/grfork/rakudo/share/perl6/site/sources/41086D8434573AB5F5DAFCD0E672692B5F0D52B4 (MUGS::Client) line 454
  in method response-promise at /home/grfork/rakudo/share/perl6/site/sources/41086D8434573AB5F5DAFCD0E672692B5F0D52B4 (MUGS::Client) line 291
  in method create-account-owner at /home/grfork/rakudo/share/perl6/site/sources/41086D8434573AB5F5DAFCD0E672692B5F0D52B4 (MUGS::Client) line 306
  in block  at /home/grfork/rakudo/share/perl6/site/sources/83CCF817552C03F061F0379B20136F3997A24CB2 (MUGS::App::CLI) line 181
  in block  at /home/grfork/rakudo/share/perl6/site/sources/83CCF817552C03F061F0379B20136F3997A24CB2 (MUGS::App::CLI) line 167
  in method ensure-authenticated-session at /home/grfork/rakudo/share/perl6/site/sources/83CCF817552C03F061F0379B20136F3997A24CB2 (MUGS::App::CLI) line 158
  in sub play-via-local-ui at /home/grfork/rakudo/share/perl6/site/sources/0A644779C4CFF233C3B9C41DB4F0ABEAB0C9E894 (MUGS::App::LocalUI) line 285
  in sub MAIN at /home/grfork/rakudo/share/perl6/site/sources/83CCF817552C03F061F0379B20136F3997A24CB2 (MUGS::App::CLI) line 457
  in block <unit> at /home/grfork/rakudo/share/perl6/site/resources/AD5BA53464E40F04792B081241246B98D32B66DA line 5
  in sub MAIN at /home/grfork/rakudo/share/perl6/site/bin/mugs-cli line 3
  in block <unit> at /home/grfork/rakudo/share/perl6/site/bin/mugs-cli line 1

Unable to create user 'def'.