This is a regression from #15814 which unintentionally changed the return type of Float32#abs to Float64. Previously, it returned Float32.

Math.copysign(self, 1) falls back to the overload without restrictions which converts both arguments to Float64 and thus returns Float64.

This patch fixes that by explicitly targeting the Math.copysign(Float32, Float32) overload for Float32#abs.
Float64#abs is not broken, but still applies an unnecessary integer-to-float conversion when we should be using a float right away.

I discovered this type mismatch while researching #13389