JSON parsing issue with `UINT64` / `INT64` enum values

[lilleyse]

The following schema is unsafe when parsed by the built-in JSON parser in JavaScript.

{
  "enums": {
    "model": {
      "valueType": "UINT64",
      "values": [
        {
          "value": 9007199254740991, // parsed as 9007199254740991
          "name": "Floor"
        },
        {
          "value": 9007199254740992, // parsed as 9007199254740992
          "name": "Wall"
        },
        {
          "value": 9007199254740993, // xxx - parsed as 9007199254740992, not exactly representable as JavaScript Number
          "name": "Door"
        }
      ]
    }
  }
}

Should "value" be a string instead?

{
  "enums": {
    "model": {
      "valueType": "UINT64",
      "values": [
        {
          "value": "9007199254740991",
          "name": "Floor"
        },
        {
          "value": "9007199254740992",
          "name": "Wall"
        },
        {
          "value": "9007199254740993",
          "name": "Door"
        }
      ]
    }
  }
}

[javagl]

Somewhat related: CesiumGS/3d-tiles-validator#251

This doesn't necessarily cause a problem in C/C++/C#/Java, but in JavaScript, it may be quirky. If it was a string, it would raise the question at which point (where, by whom, why, and how) would this be converted into something that is not a string. (No strong opinion, though ...)