mishoo/UglifyJS — comment on commit bb033d4c8d4ce41481981d8a9cee1744d960ceb9
File: lib/process.js line 1059
By majek:

This should also contain `\x00-\x1f` and `\u007f`, [reference](https://github.com/douglascrockford/JSON-js/blob/47a9882cddeb1e8529e07af9736218075372b8ac/json2.js#L197)