code: func (config *Config) KeysForSection(sectionName string) []string {
  	section := config.sectionForName(sectionName)
  
  	if section != nil {
  		keys := make([]string, 0, len(section.values))
  		for key := range section.values {
  			keys = append(keys, key)
  		}
  		sort.Strings(keys)
  		return keys
  	}
  
  	return nil
  }
docs: /*
  KeysForSection returns all of the keys found in the section named sectionName.
  
  If the section name matches the config.name or "" the global data is searched.
  */