ruby 1.9.2p180 (2011-02-18) [i386-mingw32]

irb(main):001:0> ARGF.class
=> ARGF.class

What does "ARGF.class" mean? Isn't ARGF a special IO object, whose class
is "IO", just like STDIN?

irb(main):002:0> STDIN.class
=> IO

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