driver/converter.go
func convertNvFloat(v interface{}, max float64) (driver.Value, error) {

	if v == nil {
		return v, nil
	}

	rv := reflect.ValueOf(v)
	switch rv.Kind() {

	case reflect.Float32, reflect.Float64:
		f64 := rv.Float()
		if math.Abs(f64) > max {
			return nil, ErrFloatOutOfRange
		}
		return f64, nil
	case reflect.Ptr:
		// indirect pointers
		if rv.IsNil() {
			return nil, nil
		}
		return convertNvFloat(rv.Elem().Interface(), max)
	}

	return nil, fmt.Errorf("unsupported float conversion type error %[1]T %[1]v", v)
}
func convertNvFloat(v interface{}, max float64) (driver.Value, error) {

	if v == nil {
		return v, nil
	}

	rv := reflect.ValueOf(v)
	switch rv.Kind() {

	case reflect.Float32, reflect.Float64:
		f64 := rv.Float()
		if math.Abs(f64) > max {
			return nil, ErrFloatOutOfRange
		}
		return f64, nil
	case reflect.Ptr:
		// indirect pointers
		if rv.IsNil() {
			return nil, nil
		}
		return convertNvFloat(rv.Elem().Interface(), max)
	}

	return nil, fmt.Errorf("unsupported float conversion type error %[1]T %[1]v", v)
}
// float types