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Re:Username ending with MIME type format is not allowed by denton-scratch on Wednesday September 15, 2021 @09:29AM (#28538793)
In practice, yes.

I have two middle names; most financial service providers decline to recognise my second middle-name. Same goes for the taxman and my pension provider. It seems that a "full name" is no longer a canonical identifier for a person, just really a kind of nickname; the canonical identifier is now an account-number, employee-ID or whatever.

Re:Username ending with MIME type format is not allowed by michaelt on Wednesday September 15, 2021 @03:44PM (#28543487)
Thanks to marriage, names were non-canonical before the computer was even invented.
Re:Username ending with MIME type format is not allowed by IIsi50MHz on Wednesday September 15, 2021 @07:38PM (#28545907)
And thanks to people moving house, or even changing profession, or acquiring some defining trait or accomplishment. With most people being undocumented throughout history, names could be much more fluid, like the way a person's "nickname" may change many times with or without consent.