Username restrictions

Hi there,

i just discovered vikunja and installed it on a yunohost instance.
And already i have a suggestion - username restrictions.

I got the “invalid data” message when i wanted to try with the username i use in my yunohost installation for all apps - firstname.lastname

Problem seems to be the “.” - the full stop/period symbol in the username. Changin or leavin that makes registration possible.

But it is a bit annoying as i’d prefer a consistend username all over my “personal cloud”

Why is this restriction and is it possible to allow common special characters like the “.”
e.g. a “_” is no problem.

The restriction exists because the username must not look like a URL.