{
  "date": "2026-10-10",
  "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": "Marked locale",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "en​-US",
      "output": "en-US",
      "input_codepoints": "U+0065 U+006E U+200B U+002D U+0055 U+0053",
      "output_codepoints": "U+0065 U+006E U+002D U+0055 U+0053",
      "status": "Removed 1 invisible character",
      "before": {
        "accepted": false,
        "errorName": "RangeError"
      },
      "after": {
        "accepted": true,
        "baseName": "en-US",
        "language": "en",
        "region": "US"
      }
    },
    {
      "label": "Plain locale",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "en-US",
      "output": "en-US",
      "input_codepoints": "U+0065 U+006E U+002D U+0055 U+0053",
      "output_codepoints": "U+0065 U+006E U+002D U+0055 U+0053",
      "status": "No selected invisible characters found",
      "before": {
        "accepted": true,
        "baseName": "en-US",
        "language": "en",
        "region": "US"
      },
      "after": {
        "accepted": true,
        "baseName": "en-US",
        "language": "en",
        "region": "US"
      }
    },
    {
      "label": "Underscore locale",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "en_US",
      "output": "en_US",
      "input_codepoints": "U+0065 U+006E U+005F U+0055 U+0053",
      "output_codepoints": "U+0065 U+006E U+005F U+0055 U+0053",
      "status": "No selected invisible characters found",
      "before": {
        "accepted": false,
        "errorName": "RangeError"
      },
      "after": {
        "accepted": false,
        "errorName": "RangeError"
      }
    },
    {
      "label": "Retained joiner",
      "stage": "direct string",
      "mode": "keep",
      "enabled": true,
      "input": "en‍-US",
      "output": "en‍-US",
      "input_codepoints": "U+0065 U+006E U+200D U+002D U+0055 U+0053",
      "output_codepoints": "U+0065 U+006E U+200D U+002D U+0055 U+0053",
      "status": "No selected invisible characters found",
      "before": {
        "accepted": false,
        "errorName": "RangeError"
      },
      "after": {
        "accepted": false,
        "errorName": "RangeError"
      }
    }
  ]
}