code: func NewNativeStore(file store, helperSuffix string) Store {
  	name := remoteCredentialsPrefix + helperSuffix
  	return &nativeStore{
  		programFunc: client.NewShellProgramFunc(name),
  		fileStore:   NewFileStore(file),
  	}
  }
docs: // NewNativeStore creates a new native store that
  // uses a remote helper program to manage credentials.