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- ServerError: AsyncErr: ServerThread::run Lua: Runtime error from mod
  '' in callback on_chat_message(): /config2/.minetest/mods/szutilpack/
  szutil_suadmin/init.lua:89: attempt to index field 'settings' (a
  userdata value)

- szutil_watch needs to save player inventory, watch for race
  conditions.

- Make szutil_invite accept multiple invitee names, w/ commas, maybe
  even globs/wildcards?

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