{
  "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 hidden key",
      "stage": "direct string",
      "mode": "keep",
      "input": "{\"user\":1,\"us​er\":2}",
      "output": "{\"user\":1,\"user\":2}",
      "input_codepoints": "U+007B U+0022 U+0075 U+0073 U+0065 U+0072 U+0022 U+003A U+0031 U+002C U+0022 U+0075 U+0073 U+200B U+0065 U+0072 U+0022 U+003A U+0032 U+007D",
      "output_codepoints": "U+007B U+0022 U+0075 U+0073 U+0065 U+0072 U+0022 U+003A U+0031 U+002C U+0022 U+0075 U+0073 U+0065 U+0072 U+0022 U+003A U+0032 U+007D",
      "status": "Removed 1 invisible character",
      "before": {
        "keys": [
          "user",
          "us​er"
        ],
        "user": 1,
        "values": [
          1,
          2
        ]
      },
      "after": {
        "keys": [
          "user"
        ],
        "user": 2,
        "values": [
          2
        ]
      }
    },
    {
      "label": "Escaped hidden key",
      "stage": "direct string",
      "mode": "keep",
      "input": "{\"user\":1,\"us\\u200ber\":2}",
      "output": "{\"user\":1,\"us\\u200ber\":2}",
      "input_codepoints": "U+007B U+0022 U+0075 U+0073 U+0065 U+0072 U+0022 U+003A U+0031 U+002C U+0022 U+0075 U+0073 U+005C U+0075 U+0032 U+0030 U+0030 U+0062 U+0065 U+0072 U+0022 U+003A U+0032 U+007D",
      "output_codepoints": "U+007B U+0022 U+0075 U+0073 U+0065 U+0072 U+0022 U+003A U+0031 U+002C U+0022 U+0075 U+0073 U+005C U+0075 U+0032 U+0030 U+0030 U+0062 U+0065 U+0072 U+0022 U+003A U+0032 U+007D",
      "status": "No selected invisible characters found",
      "before": {
        "keys": [
          "user",
          "us​er"
        ],
        "user": 1,
        "values": [
          1,
          2
        ]
      },
      "after": {
        "keys": [
          "user",
          "us​er"
        ],
        "user": 1,
        "values": [
          1,
          2
        ]
      }
    },
    {
      "label": "Hidden character in a value",
      "stage": "direct string",
      "mode": "keep",
      "input": "{\"note\":\"re​view\"}",
      "output": "{\"note\":\"review\"}",
      "input_codepoints": "U+007B U+0022 U+006E U+006F U+0074 U+0065 U+0022 U+003A U+0022 U+0072 U+0065 U+200B U+0076 U+0069 U+0065 U+0077 U+0022 U+007D",
      "output_codepoints": "U+007B U+0022 U+006E U+006F U+0074 U+0065 U+0022 U+003A U+0022 U+0072 U+0065 U+0076 U+0069 U+0065 U+0077 U+0022 U+007D",
      "status": "Removed 1 invisible character",
      "before": {
        "keys": [
          "note"
        ],
        "user": null,
        "values": [
          "re​view"
        ]
      },
      "after": {
        "keys": [
          "note"
        ],
        "user": null,
        "values": [
          "review"
        ]
      }
    }
  ]
}