fails:ARGF.codepoints is a public method
fails:ARGF.codepoints does not require arguments
fails:ARGF.codepoints returns self when passed a block
fails:ARGF.codepoints returns an Enumerator when passed no block
fails:ARGF.codepoints yields each codepoint of all streams
fails:ARGF.codepoints when no block is given returns an Enumerator
fails:ARGF.codepoints when no block is given returned Enumerator size should return nil
