code: func (b *Builder) replaceAliases(input string) string {
  	replaced := []string{}
  	for _, arg := range strings.Split(input, ",") {
  		if aliases, ok := b.mapper.AliasesForResource(arg); ok {
  			arg = strings.Join(aliases, ",")
  		}
  		replaced = append(replaced, arg)
  	}
  	return strings.Join(replaced, ",")
  }
docs: // replaceAliases accepts an argument and tries to expand any existing
  // aliases found in it