code: func (t *Tag) Int(i int) (int, error) {
  	if t.format != IntVal {
  		return 0, t.typeErr(IntVal)
  	}
  	return int(t.intVals[i]), nil
  }
docs: // Int returns the tag's i'th value as an integer. It returns an error if the
  // tag's Format is not IntVal. It panics if i is out of range.