Email is case-sensitive during sign-in

1. What went wrong? A user tried to login with an email in upper case, but it failed because the email wasn't found. 2. What did you expect to happen? I expected the email to be case insensitive and the login to success, in particular because Devise seems to be configured like this (see https://github.com/decidim/decidim/blob/master/decidim-core/config/initializers/devise.rb#L54). It is in fact a bug in the User model (https://github.com/decidim/decidim/blob/master/decidim-core/app/models/decidim/user.rb#L120-L126) 3. Where did you found this bug (which site)? On MetaDecidim and during development 4. Thanks :)