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ruby to_a

class SubArray < Array; end
ary1 = Array([1, 2, 3, 4])
ary2 = SubArray([1, 2, 3, 4])

ary1.to_a        # => [1, 2, 3, 4]
ary1.to_a.class  # => Array

ary2.to_a        # => [1, 2, 3, 4]
ary2.to_a.class  # => Array

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