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由 Santiago Pastorino 提交于
This reverts commit abf8de85. We should take a deeper look to those cases flat_map doesn't do deep flattening. irb(main):002:0> [[[1,3], [1,2]]].map{|i| i}.flatten => [1, 3, 1, 2] irb(main):003:0> [[[1,3], [1,2]]].flat_map{|i| i} => [[1, 3], [1, 2]]
a0613ad8