{
  "date": "2026-10-17",
  "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": "Marked lone high surrogate",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "\ud800​",
      "output": "\ud800",
      "input_codepoints": "U+D800 U+200B",
      "output_codepoints": "U+D800",
      "status": "Removed 1 invisible character",
      "before": {
        "json": "\"\\ud800​\"",
        "roundtripExact": true,
        "utf16Units": [
          "d800",
          "200b"
        ],
        "utf8Hex": "efbfbde2808b"
      },
      "after": {
        "json": "\"\\ud800\"",
        "roundtripExact": true,
        "utf16Units": [
          "d800"
        ],
        "utf8Hex": "efbfbd"
      }
    },
    {
      "label": "Lone high surrogate",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "\ud800",
      "output": "\ud800",
      "input_codepoints": "U+D800",
      "output_codepoints": "U+D800",
      "status": "No selected invisible characters found",
      "before": {
        "json": "\"\\ud800\"",
        "roundtripExact": true,
        "utf16Units": [
          "d800"
        ],
        "utf8Hex": "efbfbd"
      },
      "after": {
        "json": "\"\\ud800\"",
        "roundtripExact": true,
        "utf16Units": [
          "d800"
        ],
        "utf8Hex": "efbfbd"
      }
    },
    {
      "label": "Replacement character",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "�",
      "output": "�",
      "input_codepoints": "U+FFFD",
      "output_codepoints": "U+FFFD",
      "status": "No selected invisible characters found",
      "before": {
        "json": "\"�\"",
        "roundtripExact": true,
        "utf16Units": [
          "fffd"
        ],
        "utf8Hex": "efbfbd"
      },
      "after": {
        "json": "\"�\"",
        "roundtripExact": true,
        "utf16Units": [
          "fffd"
        ],
        "utf8Hex": "efbfbd"
      }
    },
    {
      "label": "Paired emoji",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "😀",
      "output": "😀",
      "input_codepoints": "U+1F600",
      "output_codepoints": "U+1F600",
      "status": "No selected invisible characters found",
      "before": {
        "json": "\"😀\"",
        "roundtripExact": true,
        "utf16Units": [
          "d83d",
          "de00"
        ],
        "utf8Hex": "f09f9880"
      },
      "after": {
        "json": "\"😀\"",
        "roundtripExact": true,
        "utf16Units": [
          "d83d",
          "de00"
        ],
        "utf8Hex": "f09f9880"
      }
    }
  ]
}