devise

https://github.com/plataformatec/devise

Ruby

Flexible authentication solution for Rails with Warden.

Mail::Multibyte::Chars#downcase

Convert characters in the string to lowercase.

Example:
  Mail::Multibyte.mb_chars('VĚDA A VÝZKUM').downcase.to_s # => "věda a výzkum"

Source | Google | Stack overflow

Edit

git clone [email protected]:plataformatec/devise.git
cd devise
open

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Mail--Multibyte--Chars-downcase-for-pr

# Commit to git
git add git commit -m "better docs for Mail::Multibyte::Chars#downcase"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Mail--Multibyte--Chars-downcase-for-pr
hub pull-request

# Celebrate!