code: func StringList(v ...Stringable) *StringListExpr {
  	rv := &StringListExpr{Literal: []*StringExpr{}}
  	for _, item := range v {
  		rv.Literal = append(rv.Literal, item.String())
  	}
  	return rv
  }
docs: // StringList returns a new StringListExpr representing the literal value v.