code: func MultipleOfMustBePositive(name, in string, factor interface{}) *Validation {
  	return &Validation{
  		code:    MultipleOfMustBePositiveCode,
  		Name:    name,
  		In:      in,
  		Value:   factor,
  		message: fmt.Sprintf(multipleOfMustBePositive, name, factor),
  	}
  }
docs: // MultipleOfMustBePositive error for when a
  // multipleOf factor is negative