code: func (ns *Namespace) Round(x interface{}) (float64, error) {
  	xf, err := cast.ToFloat64E(x)
  	if err != nil {
  		return 0, errors.New("Round operator can't be used with non-float value")
  	}
  
  	return _round(xf), nil
  }
docs: // Round returns the nearest integer, rounding half away from zero.