An escaped character looks like this:

```
                    {
                      "type": "escapeChar",
                      "value": "n",
                      "from": 59,
                      "to": 61,
                      "raw": "\\n"
                    },
```

An escaped hex like this:

```
                              "type": "escape",
                              "name": "identifier",
                              "value": "[",
                              "from": 33,
                              "to": 34,
                              "raw": "["
                            },
```

For consistency, should the `\\` be included in the `raw` property or not?