code: function rewrite (raw) {
    var c = raw.charAt(0)
    var path = raw.slice(1)
    if (allowedKeywordsRE.test(path)) {
      return raw
    } else {
      path = path.indexOf('"') > -1
        ? path.replace(restoreRE, restore)
        : path
      return c + 'this.' + path
    }
  }
docs: Path rewrite replacer
  
  @param {String} raw
  @return {String}