code: func (p *PullPolicy) String() string {
  	if len(string(*p)) == 0 {
  		return string(DefaultBuilderPullPolicy)
  	}
  	return string(*p)
  }
docs: // String implements the String() function of pflags.Value so this can be used as
  // command line parameter.
  // This method is really used just to show the default value when printing help.
  // It will not default the configuration.