{
  "date": "2026-10-21",
  "runtime": "v24.19.0",
  "versions": {
    "node": "24.19.0",
    "acorn": "8.17.0",
    "ada": "3.4.4",
    "amaro": "1.1.10",
    "ares": "1.34.6",
    "brotli": "1.2.0",
    "cldr": "48.0",
    "icu": "78.3",
    "llhttp": "9.4.3",
    "merve": "1.2.2",
    "modules": "137",
    "napi": "10",
    "nbytes": "0.1.4",
    "ncrypto": "0.0.1",
    "nghttp2": "1.69.0",
    "nghttp3": "",
    "ngtcp2": "",
    "openssl": "3.5.7",
    "simdjson": "4.6.4",
    "simdutf": "6.4.0",
    "sqlite": "3.53.3",
    "tz": "2026b",
    "undici": "7.29.0",
    "unicode": "17.0",
    "uv": "1.52.1",
    "uvwasi": "0.0.23",
    "v8": "13.6.233.17-node.51",
    "zlib": "1.3.2.1-motley-3246f1b",
    "zstd": "1.5.7"
  },
  "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": "Marker with lone high surrogate",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "A​\ud800B",
      "output": "A\ud800B",
      "input_codepoints": "U+0041 U+200B U+D800 U+0042",
      "output_codepoints": "U+0041 U+D800 U+0042",
      "status": "Removed 1 invisible character",
      "before": {
        "wellFormed": false,
        "repaired": "A​�B",
        "repairedWellFormed": true,
        "originalLength": 4,
        "repairedLength": 4
      },
      "after": {
        "wellFormed": false,
        "repaired": "A�B",
        "repairedWellFormed": true,
        "originalLength": 3,
        "repairedLength": 3
      }
    },
    {
      "label": "Lone low surrogate",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "A\udc00B",
      "output": "A\udc00B",
      "input_codepoints": "U+0041 U+DC00 U+0042",
      "output_codepoints": "U+0041 U+DC00 U+0042",
      "status": "No selected invisible characters found",
      "before": {
        "wellFormed": false,
        "repaired": "A�B",
        "repairedWellFormed": true,
        "originalLength": 3,
        "repairedLength": 3
      },
      "after": {
        "wellFormed": false,
        "repaired": "A�B",
        "repairedWellFormed": true,
        "originalLength": 3,
        "repairedLength": 3
      }
    },
    {
      "label": "Valid emoji pair",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "A😀B",
      "output": "A😀B",
      "input_codepoints": "U+0041 U+1F600 U+0042",
      "output_codepoints": "U+0041 U+1F600 U+0042",
      "status": "No selected invisible characters found",
      "before": {
        "wellFormed": true,
        "repaired": "A😀B",
        "repairedWellFormed": true,
        "originalLength": 4,
        "repairedLength": 4
      },
      "after": {
        "wellFormed": true,
        "repaired": "A😀B",
        "repairedWellFormed": true,
        "originalLength": 4,
        "repairedLength": 4
      }
    },
    {
      "label": "Replacement control",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "A�B",
      "output": "A�B",
      "input_codepoints": "U+0041 U+FFFD U+0042",
      "output_codepoints": "U+0041 U+FFFD U+0042",
      "status": "No selected invisible characters found",
      "before": {
        "wellFormed": true,
        "repaired": "A�B",
        "repairedWellFormed": true,
        "originalLength": 3,
        "repairedLength": 3
      },
      "after": {
        "wellFormed": true,
        "repaired": "A�B",
        "repairedWellFormed": true,
        "originalLength": 3,
        "repairedLength": 3
      }
    }
  ]
}