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由 yuuji.yaginuma 提交于
`NilClass`, `FalseClass`, `TrueClass`, `Symbol` and `Numeric` can dup with Ruby 2.4+. Ref: https://bugs.ruby-lang.org/issues/12979
2cb85581
`NilClass`, `FalseClass`, `TrueClass`, `Symbol` and `Numeric` can dup with Ruby 2.4+. Ref: https://bugs.ruby-lang.org/issues/12979