{
  "date": "2026-10-04",
  "runtime": "v24.19.0",
  "app_sha256": "b5b23e8c7028a1ee6ede9b41b459f5213af44661fc42f3d8c07b4a45f99c0644",
  "method": "Synthetic fixtures, not Claude samples. Actual homepage script in minimal DOM. Invisible checkbox on; dash Keep unless matrix says otherwise. Observations are fixture-specific, not general application tests.",
  "rows": [
    {
      "label": "Literal bug demonstration",
      "stage": "direct string",
      "mode": "keep",
      "input": "```js\nconst sample = \"A​B\";\n```",
      "output": "```js\nconst sample = \"AB\";\n```",
      "input_codepoints": "U+0060 U+0060 U+0060 U+006A U+0073 U+000A U+0063 U+006F U+006E U+0073 U+0074 U+0020 U+0073 U+0061 U+006D U+0070 U+006C U+0065 U+0020 U+003D U+0020 U+0022 U+0041 U+200B U+0042 U+0022 U+003B U+000A U+0060 U+0060 U+0060",
      "output_codepoints": "U+0060 U+0060 U+0060 U+006A U+0073 U+000A U+0063 U+006F U+006E U+0073 U+0074 U+0020 U+0073 U+0061 U+006D U+0070 U+006C U+0065 U+0020 U+003D U+0020 U+0022 U+0041 U+0042 U+0022 U+003B U+000A U+0060 U+0060 U+0060",
      "status": "Removed 1 invisible character",
      "before": {
        "fenceCount": 2,
        "lineFeeds": 2,
        "hasWrittenEscape": false,
        "hasLiteralZeroWidth": true,
        "leadingIndent": false
      },
      "after": {
        "fenceCount": 2,
        "lineFeeds": 2,
        "hasWrittenEscape": false,
        "hasLiteralZeroWidth": false,
        "leadingIndent": false
      }
    },
    {
      "label": "Written escape demonstration",
      "stage": "direct string",
      "mode": "keep",
      "input": "```js\nconst sample = \"A\\u200BB\";\n```",
      "output": "```js\nconst sample = \"A\\u200BB\";\n```",
      "input_codepoints": "U+0060 U+0060 U+0060 U+006A U+0073 U+000A U+0063 U+006F U+006E U+0073 U+0074 U+0020 U+0073 U+0061 U+006D U+0070 U+006C U+0065 U+0020 U+003D U+0020 U+0022 U+0041 U+005C U+0075 U+0032 U+0030 U+0030 U+0042 U+0042 U+0022 U+003B U+000A U+0060 U+0060 U+0060",
      "output_codepoints": "U+0060 U+0060 U+0060 U+006A U+0073 U+000A U+0063 U+006F U+006E U+0073 U+0074 U+0020 U+0073 U+0061 U+006D U+0070 U+006C U+0065 U+0020 U+003D U+0020 U+0022 U+0041 U+005C U+0075 U+0032 U+0030 U+0030 U+0042 U+0042 U+0022 U+003B U+000A U+0060 U+0060 U+0060",
      "status": "No selected invisible characters found",
      "before": {
        "fenceCount": 2,
        "lineFeeds": 2,
        "hasWrittenEscape": true,
        "hasLiteralZeroWidth": false,
        "leadingIndent": false
      },
      "after": {
        "fenceCount": 2,
        "lineFeeds": 2,
        "hasWrittenEscape": true,
        "hasLiteralZeroWidth": false,
        "leadingIndent": false
      }
    },
    {
      "label": "Indented code and prose",
      "stage": "direct string",
      "mode": "keep",
      "input": "# Note\n\n    print(\"re⁠view\")\n\nKeep  two spaces.\n",
      "output": "# Note\n\n    print(\"review\")\n\nKeep  two spaces.\n",
      "input_codepoints": "U+0023 U+0020 U+004E U+006F U+0074 U+0065 U+000A U+000A U+0020 U+0020 U+0020 U+0020 U+0070 U+0072 U+0069 U+006E U+0074 U+0028 U+0022 U+0072 U+0065 U+2060 U+0076 U+0069 U+0065 U+0077 U+0022 U+0029 U+000A U+000A U+004B U+0065 U+0065 U+0070 U+0020 U+0020 U+0074 U+0077 U+006F U+0020 U+0073 U+0070 U+0061 U+0063 U+0065 U+0073 U+002E U+000A",
      "output_codepoints": "U+0023 U+0020 U+004E U+006F U+0074 U+0065 U+000A U+000A U+0020 U+0020 U+0020 U+0020 U+0070 U+0072 U+0069 U+006E U+0074 U+0028 U+0022 U+0072 U+0065 U+0076 U+0069 U+0065 U+0077 U+0022 U+0029 U+000A U+000A U+004B U+0065 U+0065 U+0070 U+0020 U+0020 U+0074 U+0077 U+006F U+0020 U+0073 U+0070 U+0061 U+0063 U+0065 U+0073 U+002E U+000A",
      "status": "Removed 1 invisible character",
      "before": {
        "fenceCount": 0,
        "lineFeeds": 5,
        "hasWrittenEscape": false,
        "hasLiteralZeroWidth": false,
        "leadingIndent": true
      },
      "after": {
        "fenceCount": 0,
        "lineFeeds": 5,
        "hasWrittenEscape": false,
        "hasLiteralZeroWidth": false,
        "leadingIndent": true
      }
    }
  ]
}