Rails
Ruby 2.5.0
6.1
6.0
5.2
5.1
5.0
4.2
2.6.0
2.7.0
3.0
Ruby変更履歴
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NEWS for Ruby 2.5.0
NEWS for Ruby 2.4.0
NEWS for Ruby 2.3.0
NEWS for Ruby 2.2.0
NEWS for Ruby 2.1.0
NEWS for Ruby 2.0.0
ruby 1.9 feature