It generates to much underlines

[stepanhakobyan]

When there is a property named "__metadata", json-ts generates "___metadata" with 3 underlines instead of two.
Same problem is with 3, 4 and so on.
It works well with 1 underline only.

Here is an example, a cropped down json received from SharePoint api,
There are "__metadata" and "__deferred" and generation is incorrect in both cases.

{
    "d": {
      "__metadata": {
        "id": "5206ff12-fa86-4b93-8b1a-51d6d8f8d42c",
        "uri": "https://spserver2016.armsoft.am/_api/Web/Lists(guid'2ff3c593-f85c-41fe-a5c1-3ff11cfe455f')/Items(1591)",
        "etag": "\"2\"",
        "type": "SP.Data.ReviewListItem"
      },
      "FirstUniqueAncestorSecurableObject": {
        "__deferred": {
          "uri": "https://spserver2016.armsoft.am/_api/Web/Lists(guid'2ff3c593-f85c-41fe-a5c1-3ff11cfe455f')/Items(1591)/FirstUniqueAncestorSecurableObject"
        }
      },
      "FileSystemObjectType": 1,
      "Id": 1591
    }
  }

and the generated code is

interface IRootObject {
    d: ID;
}
interface ID {
    ___metadata: I___metadata;
    FirstUniqueAncestorSecurableObject: IFirstUniqueAncestorSecurableObject;
    FileSystemObjectType: number;
    Id: number;
}
interface I___metadata {
    id: string;
    uri: string;
    etag: string;
    type: string;
}
interface IFirstUniqueAncestorSecurableObject {
    ___deferred: I___deferred;
}
interface I___deferred {
    uri: string;
}