Float32 conversion as in Grisu

Author: isentropic

src/ryu.jl

@@ -9,7 +9,7 @@ function plain_precision_heuristic(xs::AbstractArray{<:AbstractFloat})
         if isapprox(y, 0, atol=1e-16)
             continue
         end
-        _, e10 = Ryu.reduce_shortest(y)
+        _, e10 = Ryu.reduce_shortest(convert(Float32, y))
         e10min = min(e10min, e10)
         e10max = max(e10max, e10)
     end