{"abstract":"Compression benefit includes content coding overhead.","category":"Content negotiation","checks":4,"contract":"Given raw, candidates, overhead, compression benefit includes content coding overhead. Return the protocol decision or transformed value; fields are validated and fixtures state boundary outcomes.","evaluation_group":"xh-compression-benefit-includes-content-coding-overhead","failed_approach":"The attempted repair uses `min((c for c in candidates if c[1]+overhead <= raw),key=lambda c:c[1],default=(None,))[0]` and still violates a separate fixture.","family":"xh-compression-benefit-includes-content-coding-overhead","id":"FA-6876","implementations":{"attempt":{"sha256":"a2346fe6bd9ceef5d4a2b9def164e747b13e1943b775c68d120bbc908baf2965","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(raw, candidates, overhead):\n    return min((c for c in candidates if c[1]+overhead <= raw),key=lambda c:c[1],default=(None,))[0]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(100, [('gzip', 95)], 10), None)\", \"check('fixture 2', solve(100, [('gzip', 90)], 10), None)\", \"check('fixture 3', solve(100, [('gzip', 70), ('br', 60)], 10), 'br')\", \"check('fixture 4', solve(100, [], 10), None)\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"af054409cc5b6d662d9ee035e75dc8965b5cb9805590e2a26ce8d91572e40bd9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(raw, candidates, overhead):\n    return min(candidates,key=lambda c:c[1],default=(None,))[0]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(100, [('gzip', 95)], 10), None)\", \"check('fixture 2', solve(100, [('gzip', 90)], 10), None)\", \"check('fixture 3', solve(100, [('gzip', 70), ('br', 60)], 10), 'br')\", \"check('fixture 4', solve(100, [], 10), None)\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"c96184505dde46ed85449b0c61edff00facdea60464abee6458947cc80ca60ab","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(raw, candidates, overhead):\n    return min((c for c in candidates if c[1]+overhead < raw),key=lambda c:c[1],default=(None,))[0]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(100, [('gzip', 95)], 10), None)\", \"check('fixture 2', solve(100, [('gzip', 90)], 10), None)\", \"check('fixture 3', solve(100, [('gzip', 70), ('br', 60)], 10), 'br')\", \"check('fixture 4', solve(100, [], 10), None)\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Bounded deterministic policy model over validated inputs; not a complete protocol stack or an interoperability claim. The five variants rotate the same explicit fixture set. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xh-compression-benefit-includes-content-coding-overhead","generated_at":"2026-09-29T14:38:06.135016+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic content negotiation model isolates the compression-benefit-includes-content-coding-overhead policy at a network component boundary.","repair":"Apply the explicit compression-benefit-includes-content-coding-overhead contract, including the tested boundary and negative cases.","root_cause":"The faulty implementation uses `min(candidates,key=lambda c:c[1],default=(None,))[0]` for the compression-benefit-includes-content-coding-overhead decision.","sha256":"71bd2f952a5928ce51de6bb446d8fc18758994bb81c0e352177ed6f199a53d10","title":"Compression benefit includes content coding overhead · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":41.15,"exit_code":1,"observations":[{"actual":"gzip","check":"fixture 2","expected":null,"passed":false},{"actual":"br","check":"fixture 3","expected":"br","passed":true},{"actual":null,"check":"fixture 4","expected":null,"passed":true},{"actual":null,"check":"fixture 1","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"gzip\", \"expected\": null, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": \"br\", \"expected\": \"br\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.642,"exit_code":1,"observations":[{"actual":"gzip","check":"fixture 2","expected":null,"passed":false},{"actual":"br","check":"fixture 3","expected":"br","passed":true},{"actual":null,"check":"fixture 4","expected":null,"passed":true},{"actual":"gzip","check":"fixture 1","expected":null,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"gzip\", \"expected\": null, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": \"br\", \"expected\": \"br\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"gzip\", \"expected\": null, \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":36.636,"exit_code":0,"observations":[{"actual":null,"check":"fixture 2","expected":null,"passed":true},{"actual":"br","check":"fixture 3","expected":"br","passed":true},{"actual":null,"check":"fixture 4","expected":null,"passed":true},{"actual":null,"check":"fixture 1","expected":null,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": \"br\", \"expected\": \"br\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}