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EXPRESSION: new Map
{
  "_type": "object",
  "_subtype": "map",
  "_objectId": "<filtered>",
  "_description": "Map",
  "_size": 0,
  "_preview": {
    "_type": "object",
    "_subtype": "map",
    "_description": "Map",
    "_lossless": true,
    "_overflow": false,
    "_size": 0,
    "_properties": [],
    "_entries": []
  }
}

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EXPRESSION: map = new Map; map.set(1, 2); map.set("key", "value"); map
{
  "_type": "object",
  "_subtype": "map",
  "_objectId": "<filtered>",
  "_description": "Map",
  "_size": 2,
  "_preview": {
    "_type": "object",
    "_subtype": "map",
    "_description": "Map",
    "_lossless": true,
    "_overflow": false,
    "_size": 2,
    "_properties": [],
    "_entries": [
      {
        "_key": {
          "_type": "number",
          "_description": "1",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "number",
          "_description": "2",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      },
      {
        "_key": {
          "_type": "string",
          "_description": "key",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        },
        "_value": {
          "_type": "string",
          "_description": "value",
          "_lossless": true,
          "_overflow": false,
          "_properties": null,
          "_entries": null
        }
      }
    ]
  }
}

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EXPRESSION: map = new Map; map.set({a:1}, {b:2}); map.set(document.body, [1,2]); map
{
  "_type": "object",
  "_subtype": "map",
  "_objectId": "<filtered>",
  "_description": "Map",
  "_size": 2,
  "_preview": {
    "_type": "object",
    "_subtype": "map",
    "_description": "Map",
    "_lossless": false,
    "_overflow": false,
    "_size": 2,
    "_properties": [],
    "_entries": [
      {
        "_key": {
          "_type": "object",
          "_description": "Object",
          "_lossless": true,
          "_overflow": false,
          "_properties": [
            {
              "_name": "a",
              "_type": "number",
              "_value": "1"
            }
          ],
          "_entries": null
        },
        "_value": {
          "_type": "object",
          "_description": "Object",
          "_lossless": true,
          "_overflow": false,
          "_properties": [
            {
              "_name": "b",
              "_type": "number",
              "_value": "2"
            }
          ],
          "_entries": null
        }
      },
      {
        "_key": {
          "_type": "object",
          "_subtype": "node",
          "_description": "<body>",
          "_lossless": false,
          "_overflow": true,
          "_properties": [
            {
              "_name": "aLink",
              "_type": "string",
              "_value": ""
            },
            {
              "_name": "background",
              "_type": "string",
              "_value": ""
            },
            {
              "_name": "bgColor",
              "_type": "string",
              "_value": ""
            },
            {
              "_name": "link",
              "_type": "string",
              "_value": ""
            },
            {
              "_name": "text",
              "_type": "string",
              "_value": ""
            }
          ],
          "_entries": null
        },
        "_value": {
          "_type": "object",
          "_subtype": "array",
          "_description": "Array",
          "_lossless": true,
          "_overflow": false,
          "_size": 2,
          "_properties": [
            {
              "_name": "0",
              "_type": "number",
              "_value": "1"
            },
            {
              "_name": "1",
              "_type": "number",
              "_value": "2"
            }
          ],
          "_entries": null
        }
      }
    ]
  }
}

-----------------------------------------------------
EXPRESSION: map = new Map; for (var i = 0; i <= 100; i++) map.set(i, i); map
{
  "_type": "object",
  "_subtype": "map",
  "_objectId": "<filtered>",
  "_description": "Map",
  "_size": 101,
  "_preview": {
    "_type": "object",
    "_subtype": "map",
    "_description": "Map",
    "_lossless": false,
    "_overflow": true,
    "_size": 101,
    "_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
        }
      }
    ]
  }
}

-----------------------------------------------------
EXPRESSION: map = new Map; map.set(map, map); map
{
  "_type": "object",
  "_subtype": "map",
  "_objectId": "<filtered>",
  "_description": "Map",
  "_size": 1,
  "_preview": {
    "_type": "object",
    "_subtype": "map",
    "_description": "Map",
    "_lossless": false,
    "_overflow": false,
    "_size": 1,
    "_properties": [],
    "_entries": [
      {
        "_key": {
          "_type": "object",
          "_subtype": "map",
          "_description": "Map",
          "_lossless": false,
          "_overflow": true,
          "_size": 1,
          "_properties": [],
          "_entries": []
        },
        "_value": {
          "_type": "object",
          "_subtype": "map",
          "_description": "Map",
          "_lossless": false,
          "_overflow": true,
          "_size": 1,
          "_properties": [],
          "_entries": []
        }
      }
    ]
  }
}

-----------------------------------------------------
EXPRESSION: map = new WeakMap; strongKey = {id:1}; map.set(strongKey, [1,2]); map
{
  "_type": "object",
  "_subtype": "weakmap",
  "_objectId": "<filtered>",
  "_description": "WeakMap",
  "_size": 1,
  "_preview": {
    "_type": "object",
    "_subtype": "weakmap",
    "_description": "WeakMap",
    "_lossless": true,
    "_overflow": false,
    "_size": 1,
    "_properties": [],
    "_entries": [
      {
        "_key": {
          "_type": "object",
          "_description": "Object",
          "_lossless": true,
          "_overflow": false,
          "_properties": [
            {
              "_name": "id",
              "_type": "number",
              "_value": "1"
            }
          ],
          "_entries": null
        },
        "_value": {
          "_type": "object",
          "_subtype": "array",
          "_description": "Array",
          "_lossless": true,
          "_overflow": false,
          "_size": 2,
          "_properties": [
            {
              "_name": "0",
              "_type": "number",
              "_value": "1"
            },
            {
              "_name": "1",
              "_type": "number",
              "_value": "2"
            }
          ],
          "_entries": null
        }
      }
    ]
  }
}