What makes a valid username on JupyterHub / TLJH?

Hi! As a hub admin I wondered what consists a valid username for hub users. Are there any pitfalls with special characters, etc? Is it a good idea to use someones email address for example?

I could not find any info on this here

On TLJH all users are created as operating system users, so that’s probably the main restriction on supported usernames. I can’t think of any other limitations at the moment.

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