func runtime.modf

4 uses

	runtime (current package)
		float.go#L77: 		d, fract := modf(-x)
		float.go#L83: 	d, _ := modf(x)
		float.go#L111: func modf(f float64) (int float64, frac float64) {
		float.go#L115: 			int, frac = modf(-f)