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 More than one method matched your request. You can refine
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      StringIO#<<, Module#<, Module#<=, Module#<=>, IO#<<, Queue#<<,
      Logger#<<, SizedQueue#<<, StringScanner#<<, Time#<=>, Array#<<,
      Array#<=>, Set#<<, Pathname#<=>, Complex#<=>, Bignum#<<,
      Bignum#<=>, Float#<, Float#<=, Float#<=>, File::Stat#<=>,
      Fixnum#<<, Fixnum#<, Fixnum#<=, Fixnum#<=>, Comparable#<,
      Comparable#<=, Numeric#<=>, Rational#<=>, String#<<, String#<=>,
      Date#<<, Date#<=>, Zlib::GzipWriter#<<, Zlib::Deflate#<<,
      Zlib::Inflate#<<

 Array#<< Array#<=> Comparable#< Comparable#<= Complex#<=>
 Curses::Window#<< File::Stat#<=> Float#< Float#<= Float#<=>
 IO#<< Included#<< Integer#< Integer#<< Integer#<=
 Integer#<=> Module#< Module#<= Module#<=> Queue#<<
 Rational#<=> String#< String#<< String#<= String#<=>
 StringIO#<< Time#<=>

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