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67d34a1
(Get the code!)
Of course, we can pass --force-badname, but if we consider dots as acceptable, adduser should accept them by default.
About chown, there's absolutely no need to change the tool, as long as people that add dots to their usernames and use chown from the commandline know what they are doing. Anyway, if they don't, they'll get an error message, and they'll understand the issue - newbies don't use chown.