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EXPRESSION: map = new Map; for (var i = 0; i < 1000000; i++) map.set(i, i); map
{
  "_type": "object",
  "_subtype": "map",
  "_objectId": "<filtered>",
  "_description": "Map",
  "_size": 1000000,
  "_preview": {
    "_type": "object",
    "_subtype": "map",
    "_description": "Map",
    "_lossless": false,
    "_overflow": true,
    "_size": 1000000,
    "_properties": [],
    "_entries": [
      {
        "_key": {
          "_type": "number",
          "_description": "0",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "number",
          "_description": "0",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      },
      {
        "_key": {
          "_type": "number",
          "_description": "1",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "number",
          "_description": "1",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      },
      {
        "_key": {
          "_type": "number",
          "_description": "2",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "number",
          "_description": "2",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      },
      {
        "_key": {
          "_type": "number",
          "_description": "3",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "number",
          "_description": "3",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      },
      {
        "_key": {
          "_type": "number",
          "_description": "4",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "number",
          "_description": "4",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      }
    ]
  }
}