My question was related why only that set of extrachars, adding a '=' is a 
dangerous step or not?
Reading the rest of the page it seems that everyhing is supported with 

On Wednesday, April 11, 2018 at 4:03:04 PM UTC+2, Melvyn Sopacua wrote:
> On dinsdag 10 april 2018 11:10:33 CEST Stefano Tranquillini wrote: 
> > mostly curiosity, why does the username 
> > 
> > .models.User.username allow only _, @, +, . and - characters? 
> > is there a reason for that? 
> Yeah. It's explained a few lines below in the box titled "Usernames and 
> unicode". The special chars mentioned are just as random I presume. 
> -- 
> Melvyn Sopacua 

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