First of all, thank you for this project!
During login, when I type my handle starting from '@', it says that it contains invalid characters.
It would be nice to allow to a user to type his handle in both ways - with and without '@'.
For example, here, at tangled.org, both types are supported.
Argh I should really check the tangled repo more often. Thanks for letting me know! Yeah this should be fixed will look into it 👍