I get this is CRuby
```
[1] pry(main)> RUBY_VERSION
=> "2.5.1"
[2] pry(main)> Encoding.default_internal
=> nil
[3] pry(main)> Encoding.default_internal = "EUC-JP"
=> "EUC-JP"
[4] pry(main)> w = "なまえ"
=> "なまえ"
[5] pry(main)> w.encoding
=> #<Encoding:EUC-JP>
[6] pry(main)> puts w
�ʤޤ�
=> nil
```