--- to_i

    ܥб֤ޤ

    դˤб륷ܥˤ 
    Fixnum#id2name [Fixnum/id2name] Ȥäưöʸɬפ
    ޤ

         id = :foo.to_i
         p id                  # => 8881
         p id.id2name.intern   # => :foo

    RubyμǤͽ졢ѿ̾᥽å̾ʤɤ򤳤ǴƤ
    ޤ֥Ȥб(Object#id [Object/id] 
    ޤ) Symbol б̤ΤΤǤ

