irb(main):001:0> 1
=> 1
irb(main):002:0> 2
=> 2
irb(main):003:0> 3
=> 3
irb(main):004:0> Readline::HISTORY.to_a
=> ["1", "2", "3", "Readline::HISTORY.to_a"]
irb(main):005:0>
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