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EXPRESSION: obj = {}; for (var i = 0; i < 1000; i++) obj[i] = i; obj
{
  "_type": "object",
  "_objectId": "<filtered>",
  "_description": "Object",
  "_preview": {
    "_type": "object",
    "_description": "Object",
    "_lossless": false,
    "_overflow": true,
    "_properties": [
      {
        "_name": "0",
        "_type": "number",
        "_value": "0"
      },
      {
        "_name": "1",
        "_type": "number",
        "_value": "1"
      },
      {
        "_name": "2",
        "_type": "number",
        "_value": "2"
      },
      {
        "_name": "3",
        "_type": "number",
        "_value": "3"
      },
      {
        "_name": "4",
        "_type": "number",
        "_value": "4"
      },
      {
        "_name": "5",
        "_type": "number",
        "_value": "5"
      },
      {
        "_name": "6",
        "_type": "number",
        "_value": "6"
      },
      {
        "_name": "7",
        "_type": "number",
        "_value": "7"
      },
      {
        "_name": "8",
        "_type": "number",
        "_value": "8"
      },
      {
        "_name": "9",
        "_type": "number",
        "_value": "9"
      }
    ],
    "_entries": null
  }
}