% irb irb(main):001:0> class MyString<String;end => nil irb(main):002:0> s=MyString.new("abc") => "abc" irb(main):003:0> s.to_s.class => String String#to_sはStringが返ります。 irb(main):004:0> class MyHash<Hash;end => nil irb(main):005:0> h=MyHash.new() => {} irb(m</hash;end></string;end>…