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In C, %f and %F mean the same thing. In Go, they are synonyms when scanning but %F is only accepted for complex numbers, where it produces gibberish. It's easy and safe to make it work; it'a also easy and safe to take it out for printing but leave it in for scanning. I favor making it work for printing floats and complexes but could be talked into taking it out. For scanning, though, it should stay. Resolve for 1.3.