[*0...5] #=> [0, 1, 2, 3, 4]
スター (*) での式展開はよく知られてるけど、この式展開は to_a が定義されているオブジェクトならなんにでも使えることを知った。
[23] pry(main)> String.class_eval { def to_a; self.split(''); end }
=> nil
[24] pry(main)> [*'abcde']
=> ["a", "b", "c", "d", "e"]
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