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Elixir's String.Unicode

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Bad news, everyone! We can longer complain about Unicode-unaware upcase/downcase in Elixir & Erlang anymore!

As of today, thanks to José Valim (project's leader), Elixir's upcase and downcase functions are using the Unicode database: iex(1)> String.upcase "Γεια σας" "ΓΕΙΑ ΣΑΣ"

And you can obviously use this functionality in Erlang as well: https://groups.google.com/d/msg/erlang-programming/x9WcPkQJ8zE/HyL4H37ZD2UJ

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