{
  "date": "2026-10-09",
  "runtime": "v24.19.0",
  "app_sha256": "b5b23e8c7028a1ee6ede9b41b459f5213af44661fc42f3d8c07b4a45f99c0644",
  "method": "Synthetic fixtures, not Claude samples. Actual homepage script in minimal DOM. Checkbox state and dash mode recorded in each row. Observations are fixture-specific, not general application tests.",
  "rows": [
    {
      "label": "Large marked integer",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "900719925474099​3",
      "output": "9007199254740993",
      "input_codepoints": "U+0039 U+0030 U+0030 U+0037 U+0031 U+0039 U+0039 U+0032 U+0035 U+0034 U+0037 U+0034 U+0030 U+0039 U+0039 U+200B U+0033",
      "output_codepoints": "U+0039 U+0030 U+0030 U+0037 U+0031 U+0039 U+0039 U+0032 U+0035 U+0034 U+0037 U+0034 U+0030 U+0039 U+0039 U+0033",
      "status": "Removed 1 invisible character",
      "before": {
        "number": null,
        "finite": false,
        "safeInteger": false,
        "bigint": {
          "accepted": false,
          "errorName": "SyntaxError"
        }
      },
      "after": {
        "number": 9007199254740992,
        "finite": true,
        "safeInteger": false,
        "bigint": {
          "accepted": true,
          "value": "9007199254740993"
        }
      }
    },
    {
      "label": "Large plain integer",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "9007199254740993",
      "output": "9007199254740993",
      "input_codepoints": "U+0039 U+0030 U+0030 U+0037 U+0031 U+0039 U+0039 U+0032 U+0035 U+0034 U+0037 U+0034 U+0030 U+0039 U+0039 U+0033",
      "output_codepoints": "U+0039 U+0030 U+0030 U+0037 U+0031 U+0039 U+0039 U+0032 U+0035 U+0034 U+0037 U+0034 U+0030 U+0039 U+0039 U+0033",
      "status": "No selected invisible characters found",
      "before": {
        "number": 9007199254740992,
        "finite": true,
        "safeInteger": false,
        "bigint": {
          "accepted": true,
          "value": "9007199254740993"
        }
      },
      "after": {
        "number": 9007199254740992,
        "finite": true,
        "safeInteger": false,
        "bigint": {
          "accepted": true,
          "value": "9007199254740993"
        }
      }
    },
    {
      "label": "Safe boundary",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "9007199254740991",
      "output": "9007199254740991",
      "input_codepoints": "U+0039 U+0030 U+0030 U+0037 U+0031 U+0039 U+0039 U+0032 U+0035 U+0034 U+0037 U+0034 U+0030 U+0039 U+0039 U+0031",
      "output_codepoints": "U+0039 U+0030 U+0030 U+0037 U+0031 U+0039 U+0039 U+0032 U+0035 U+0034 U+0037 U+0034 U+0030 U+0039 U+0039 U+0031",
      "status": "No selected invisible characters found",
      "before": {
        "number": 9007199254740991,
        "finite": true,
        "safeInteger": true,
        "bigint": {
          "accepted": true,
          "value": "9007199254740991"
        }
      },
      "after": {
        "number": 9007199254740991,
        "finite": true,
        "safeInteger": true,
        "bigint": {
          "accepted": true,
          "value": "9007199254740991"
        }
      }
    },
    {
      "label": "Decimal fraction",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "12.5",
      "output": "12.5",
      "input_codepoints": "U+0031 U+0032 U+002E U+0035",
      "output_codepoints": "U+0031 U+0032 U+002E U+0035",
      "status": "No selected invisible characters found",
      "before": {
        "number": 12.5,
        "finite": true,
        "safeInteger": false,
        "bigint": {
          "accepted": false,
          "errorName": "SyntaxError"
        }
      },
      "after": {
        "number": 12.5,
        "finite": true,
        "safeInteger": false,
        "bigint": {
          "accepted": false,
          "errorName": "SyntaxError"
        }
      }
    }
  ]
}