code: func readManifestFile(f fs.File) (pkg.Manifest, error) {
  	r, err := f.Open()
  	if err != nil {
  		return pkg.Manifest{}, err
  	}
  	defer r.Close()
  	return pkg.ReadManifest(r)
  }
docs: // readManifestFile decodes manifest file zipped inside the package.