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To avoid regressions, please can we leave the old `fractions.gcd` exactly as it was? 
For example, the current `fractions.gcd` *does* work for Fraction instances [1]. That's certainly not its intended use, but I wouldn't be surprised if there's code out there that uses it in that way. It also just happens to work for nonnegative finite float inputs, because a % b gives exact results when a and b are positive floats, so no error is introduced at any point.
I'd also worry about breaking existing uses involving integer-like objects (instances of numpy.int64, for example) in place of instances of ints.
[1] By "works", I mean that if a and b are Fractions then gcd(a, b) returns a Fraction such that (1) a and b are integer multiples of gcd(a, b), and (2) gcd(a, b) is an integer multiple of any other number with this property.