relative performance of FastRational is faster in your test

[JeffreySarnoff]

with Julia v1.10.0-DEV1429

using Ratios, FastRationals, BenchmarkTools

julia> @btime x + y setup=((x, y) = (SimpleRatio(rand(-20:20), rand(2:20)), SimpleRatio(rand(-20:20), rand(2:20))));
  22.668 ns (1 allocation: 32 bytes)

julia> @btime x * y setup=((x, y) = (SimpleRatio(rand(-20:20), rand(2:20)), SimpleRatio(rand(-20:20), rand(2:20))));
  22.367 ns (1 allocation: 32 bytes)


julia> @btime x + y setup=((x, y) = (FastRational(rand(-20:20), rand(2:20)), FastRational(rand(-20:20), rand(2:20))));
  5.900 ns (0 allocations: 0 bytes)

julia> @btime x * y setup=((x, y) = (FastRational(rand(-20:20), rand(2:20)), FastRational(rand(-20:20), rand(2:20))));
  5.900 ns (0 allocations: 0 bytes)