code: func defaultVersion(versions []PackageVersion) Version {
  	var versionStrings []string
  	for _, version := range versions {
  		versionStrings = append(versionStrings, version.Version.String())
  	}
  	sort.Sort(sortableSliceOfVersions(versionStrings))
  	return Version(versionStrings[len(versionStrings)-1])
  }
docs: // Determine the default version among versions. If a user calls a group client
  // without specifying the version (e.g., c.CoreV1(), instead of c.CoreV1()), the
  // default version will be returned.