Built-in Format Json command loses precision on high Int64 values

If you format this example json string using the built-in Format Json command:

```
{"id": 6150769120280496265}
```

You get this output:

```
{
  "id": 6150769120280496000
}
```

This might be because the Number type in Javascript is a floating-point number and reserves some of its bits for decimal points. To store a full Int64 value, you need `BigInt`.