code: func ToJSON(data []byte) ([]byte, error) {
  	if hasJSONPrefix(data) {
  		return data, nil
  	}
  	return yaml.YAMLToJSON(data)
  }
docs: // ToJSON converts a single YAML document into a JSON document
  // or returns an error. If the document appears to be JSON the
  // YAML decoding path is not used (so that error messages are
  // JSON specific).