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Performance cops will be extracted from RuboCop to RuboCop Performance
when next RuboCop 0.68 will be released.
rubocop/rubocop#5977
RuboCop 0.67 is its transition period.
Since rails/rails repository uses Performance cops, This PR added
rubocop-performance gem to Gemfile.
And this PR fixes some offenses using the following auto-correct.
Summary
Other Information