{ "protocol": { "name": "CVP", "version": "1.0.0-proposed", "revision": "2026-09-13", "spec_sha256": "f62725968356c92930531cd6085db76e216da06e95be53d636b0d2cf3218b148", "spec": "https://www.calculatorx.com/developers/cvp/spec/1.0" }, "document_status": "proposed", "calculator": { "id": "division", "version": "1.0.7", "title": "Division Calculator", "formula_family": "division", "capability_id": "math.divide", "verification_revision": "2026-10-28.meta-metrics-v2" }, "profile": "core", "status": "STALE", "verification_status": "VERIFIED", "production_freshness": "STALE", "overall_trust": "VERIFIED_STALE", "runner": { "name": "cvp-runner", "version": "1.0.0" }, "environment": { "runtime": "node", "runtime_version": "22.20.0", "numeric_model": "exact_integer", "os": "darwin" }, "suite": { "id": "division", "version": "1.0.7", "uri": "https://www.calculatorx.com/evidence/math.divide/1.0.7.json", "verification_revision": "2026-10-28.meta-metrics-v2" }, "obligation_set": [ "CVP-PROV-01", "CVP-MODEL-01", "CVP-SCOPE-01", "CVP-UNIT-01", "CVP-REF-01", "CVP-GOLD-01", "CVP-BND-01", "CVP-INV-01", "CVP-NUM-01", "CVP-COV-01", "CVP-CONTRACT-01", "CVP-DEP-01", "CVP-ART-01", "CVP-PROD-01", "CVP-PROP-01", "CVP-META-01", "CVP-ROUND-01", "CVP-IFACE-01" ], "provenance": { "mode": "direct", "sources": [ { "label": "ECMAScript Language Specification", "kind": "standard", "reference": "Number.prototype.toFixed ( fractionDigits )", "url": "https://tc39.es/ecma262/#sec-number.prototype.tofixed" }, { "label": "ECMAScript Language Specification", "kind": "standard", "reference": "Number type (IEEE-754 binary64)", "url": "https://tc39.es/ecma262/#sec-ecmascript-language-types-number-type" }, { "label": "IEEE Std 754-2019", "kind": "standard", "reference": "IEEE Standard for Floating-Point Arithmetic", "url": "https://standards.ieee.org/ieee/754/6210/" }, { "label": "MIT Mathematics for Computer Science — Chapter 8: Number Theory", "kind": "other", "reference": "Chapter 8, including sections 8.2–8.9 and problem 8.24", "url": "https://ocw.mit.edu/courses/6-042j-mathematics-for-computer-science-spring-2015/mit6_042js15_textbook.pdf" }, { "label": "Margaret Stevens — The Maths Workbook (University of Oxford)", "kind": "other", "reference": "Chapter 1, §1: Algebraic Expressions and Fractions; §3: Equations", "url": "https://www.some.ox.ac.uk/wp-content/uploads/2024/08/Maths-Workbook.pdf" } ] }, "controls": { "CVP-PROV-01": { "result": "PASS", "applicability": "required", "notes": "Sources present on evidence" }, "CVP-MODEL-01": { "result": "PASS", "applicability": "required", "notes": "a ÷ b quotient; long mode Euclidean q,r with a = bq + r, 0 ≤ r < b" }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "quotient or long integer division" }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "dimensionless" }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O3 mpmath a/b and Python int divmod + O2 live identities (O2 shares V8 binary64 with the IUT)" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "25/25 legacy golden; 212/212 oracle-backed numeric" }, "CVP-BND-01": { "result": "PASS", "applicability": "required", "notes": "9/9 CVP boundary · 9/9 legacy Evidence boundary" }, "CVP-INV-01": { "result": "PASS", "applicability": "required", "notes": "9 invalid-domain cases" }, "CVP-NUM-01": { "result": "PASS", "applicability": "required", "notes": "Complete output identity vs212 independently generated CPython Fraction/Decimal/int vectors, including rounding, signed truncation, normalized-operand exactness, subnormals,48-digit work and every output field; no whole-domain guarantee. Legacy Evidence `tol` is not this policy." }, "CVP-COV-01": { "result": "PASS", "applicability": "required", "notes": "Declared partitions: quotient-normal, quotient-rounding, quotient-boundary, long-normal, long-large-integer, long-boundary, invalid-domain. Counts alone are not the claim." }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "5/5 CVP contract · release-artifacts-aligned=PASS · schema-output-required-declared=PASS · schema-valid-input-executes=PASS · engine-success-output-validates-schema=PASS · rest-success-payload-validates-schema=PASS" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine divide; Node binary64" }, "CVP-ART-01": { "result": "PASS", "applicability": "required", "notes": "release_integrity.status=verified · digests: artifact_evidence_sha256=Evidence core (Trust freshness) · cvp_evidence_digest=artifacts.evidence_digest (fingerprint v2) · evidence_bundle_sha256=legacy Evidence JSON bytes · evidence_catalog_digest=attested_catalog_sha256 · production_sha256=bound production report · see artifacts.digest_registry" }, "CVP-PROD-01": { "result": "PASS", "applicability": "required", "notes": "Capability production binding: STALE · Site report: stale · STALE (freshness / digest drift after last PASS snapshot) · site report stale · local checks pass · local production checks PASS; capability production binding is not CURRENT — final status must stay STALE, not VERIFIED · attestation_id=f3abb5d04ebc51171f259234b69628b210f1534445c968974f68a48041bc5e07 · previous live site report said CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-10-28T05:32:35.458Z · Live production status STALE (210 capabilities; 166 remain CURRENT) @ 2026-10-28T10:42:46.114Z · Public schema 1.0.7 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.0.7 · report output-const=pass · evidence-sha256=pass · semantic-contract=pass · capability-html-public-origin-agree=pass · cvp-manifest-public-origin-agree=pass · cvp-latest-alias-agrees=pass · cvp-immutable-manifest-fetch=pass · cvp-immutable-manifest-sha256=pass · cvp-latest-alias-matches-immutable=pass · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=0904162d9842ae579e660eb678ec02f2ca6e852dd03b716905c0a6501acd7dae · verified_at=2026-10-28T09:09:17.252Z · evidence_attested_at=2026-10-28T09:09:17.252Z · last_confirmed_current_at=2026-10-28T09:09:17.252Z · rendered_at=2026-10-28T10:42:46.367Z · binds=cvp_core_sha256 · attestation snapshot core f170808d420a ≠ live cvp_core_sha256 e8465f3c7103 (2026-10-28.meta-metrics-v2)", "check_result": "PASS", "production_state": "STALE", "binding_current": false }, "CVP-DIM-01": { "result": "SKIP", "applicability": "not_applicable", "notes": "Unitless core calculator — no physical dimension algebra" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "8/8 property" }, "CVP-META-01": { "result": "PASS", "applicability": "applicable", "notes": "2/2 metamorphic" }, "CVP-ROUND-01": { "result": "PASS", "applicability": "applicable", "notes": "2/2 round-trips" }, "CVP-XCAL-01": { "result": "SKIP", "applicability": "not_applicable", "notes": "No related calculator in the same formula family / no related-identity peers declared — control not in obligation set" }, "CVP-IFACE-01": { "result": "PASS", "applicability": "applicable", "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 12/12 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only." }, "CVP-ORACLE-01": { "result": "SKIP", "applicability": "higher_assurance", "notes": "O2 present; O3 not required this wave" }, "CVP-EXP-01": { "result": "SKIP", "applicability": "optional", "notes": "named expert review not performed" } }, "interfaces": { "compared": [ "ui-ssr", "rest", "mcp" ], "result": "PASS", "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 12/12 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only." }, "artifacts": { "evidence_bundle_sha256": "9d0e1e03c7838013a439dc49069f0cbd53a5a3f56bf245d438ef3a15378e3996", "evidence_digest": "e8465f3c710313c8916410623980d103927ef3e68dcba61158ea697e05e9cf8d", "production_sha256": "0904162d9842ae579e660eb678ec02f2ca6e852dd03b716905c0a6501acd7dae", "attested_catalog_sha256": "163b0d7072a58bed20a0320572211167e1629730bef43c185b5f545ceac7744c", "production_checks": [ { "id": "math.divide:output-const", "status": "pass", "detail": "output const 1.0.7 vs capability 1.0.7", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:evidence-sha256", "status": "pass", "detail": "b6e6a5ddc51c", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:semantic-contract", "status": "pass", "detail": "34/34", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:capability-html-public-origin-agree", "status": "pass", "detail": "public 1.0.7 vs origin 1.0.7", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:cvp-manifest-public-origin-agree", "status": "pass", "detail": "math.divide/1.0.7/2026-10-28.meta-metrics-v2/core/e8465f3c7103", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core", "projection_compared": false }, { "id": "math.divide:cvp-latest-alias-agrees", "status": "pass", "detail": "math.divide/1.0.7/2026-10-28.meta-metrics-v2/core/e8465f3c7103", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core", "projection_compared": false }, { "id": "math.divide:cvp-immutable-manifest-fetch", "status": "pass", "detail": "public=200 origin=200", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:cvp-immutable-manifest-sha256", "status": "pass", "detail": "f170808d420a", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:cvp-latest-alias-matches-immutable", "status": "pass", "detail": "math.divide/1.0.7/2026-10-28.meta-metrics-v2/core/e8465f3c7103", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core", "projection_compared": false }, { "id": "math.divide:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" }, { "id": "math.divide:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": false, "attestation_binding_current": false, "attested_at": "2026-10-28T09:09:17.252Z", "attestation_revision": "core" } ], "digest_registry": { "digest_algorithm": "sha256", "canonicalization": "json-sorted-keys-utf8", "entries": [ { "name": "cvp_core_sha256", "field": "artifacts.cvp_core_sha256", "digest_scope": "cvp_verification_fingerprint_v2", "value": "e8465f3c710313c8916410623980d103927ef3e68dcba61158ea697e05e9cf8d", "note": "Immutable verification core; excludes attestation/live-status and Evidence contract counts" }, { "name": "cvp_evidence_digest", "field": "artifacts.evidence_digest", "digest_scope": "cvp_verification_fingerprint_v2", "value": "e8465f3c710313c8916410623980d103927ef3e68dcba61158ea697e05e9cf8d", "note": "Alias of cvp_core_sha256 (historical field name)" }, { "name": "artifact_evidence_sha256", "field": "release_integrity.digests.evidence_core_sha256", "digest_scope": "evidence_artifact_core", "value": "b6e6a5ddc51cac99b4c4018d9bc331c5621a27d90c526d1d34baf72601ccc5cb", "note": "Published Evidence JSON core — Trust freshness / production bind subject" }, { "name": "evidence_catalog_digest", "field": "artifacts.attested_catalog_sha256", "digest_scope": "capability_catalog", "value": "163b0d7072a58bed20a0320572211167e1629730bef43c185b5f545ceac7744c", "note": "Capability catalog integrity; site-wide, not per-suite fingerprint" } ] }, "cvp_core_sha256": "e8465f3c710313c8916410623980d103927ef3e68dcba61158ea697e05e9cf8d" }, "dependencies": [ { "name": "divide-engine", "version": "1.0.7" }, { "name": "divide-reference-oracle", "version": "1.0.0" }, { "name": "node", "version": "22.20.0" } ], "attestation": { "status": "STALE", "href": "/.well-known/calculatorx-production-attestation.json", "id": "f3abb5d04ebc51171f259234b69628b210f1534445c968974f68a48041bc5e07", "attested_at": "2026-10-28T09:09:17.252Z", "last_confirmed_current_at": "2026-10-28T09:09:17.252Z", "site_attestation_current": false, "capability_attestation_current": false, "bound_snapshot_status": "pass", "live_report_status": "stale", "bound_attested_at": "2026-10-28T05:32:35.458Z", "live_updated_at": "2026-10-28T10:42:46.114Z", "bound_snapshot": { "status": "pass", "attested_at": "2026-10-28T05:32:35.458Z", "site_stale_count": 210 }, "live_site_status": { "href": "/.well-known/calculatorx-production-attestation.json" }, "bound_snapshot_site_stale_count": 210, "site_stale_capability_count": 210, "evidence_attested_at": "2026-10-28T09:09:17.252Z", "stale_reason": "attestation snapshot core f170808d420a ≠ live cvp_core_sha256 e8465f3c7103 (2026-10-28.meta-metrics-v2)" }, "domain_review": { "status": "ABSENT", "spec_version": "1.0.7", "external_third_party": false, "note": "Named expert review not performed" }, "timestamps": { "verified_at": "2026-10-28T09:09:17.252Z", "generated_at": "2026-10-28T09:09:17.252Z", "rendered_at": "2026-10-28T10:42:46.367Z", "notes": "verified_at/generated_at mark the first publication of this cvp_core_sha256 (artifacts.evidence_digest alias) for suite verification. evidence_attested_at/attested_at is the first production bind of that core digest. last_confirmed_current_at is the latest site-wide report that still confirms CURRENT. rendered_at is this JSON serialization and is not part of cvp_core_sha256 / evidence_digest. Production attestation binds cvp_core_sha256 (binds evidence_digest). Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at. attestation.bound_snapshot.site_stale_count is the site-wide stale capability count at Manifest bind time — not a live value. Fetch attestation.live_site_status.href for the current site report." }, "tests": { "golden": { "passed": 212, "total": 212, "failed": 0 }, "boundary": { "passed": 9, "total": 9, "failed": 0 }, "invalid": { "passed": 9, "total": 9, "failed": 0 }, "property": { "passed": 8, "total": 8, "failed": 0 }, "round_trip": { "passed": 2, "total": 2, "failed": 0 }, "metamorphic": { "passed": 2, "total": 2, "failed": 0 }, "contract": { "passed": 5, "total": 5, "failed": 0 }, "cross_interface": { "passed": 14, "total": 14, "failed": 0 } }, "numerical": { "representation": "binary64 quotient of normalized operands; exact integer long division", "tolerance": { "type": "exact", "value": 0, "rationale": "Full output identity vs212 independent CPython Fraction/Decimal/int vectors; binary64 result is correctly rounded rational division. Not a whole-domain guarantee.", "declared_before_evaluation": true }, "claim_scope": "Complete output identity vs212 independently generated CPython Fraction/Decimal/int vectors, including rounding, signed truncation, normalized-operand exactness, subnormals,48-digit work and every output field; no whole-domain guarantee.", "ulp_applicable": false, "exact_mismatches": 0 }, "coverage": { "partitions": [ { "id": "quotient-normal", "description": "Quotient mode, ordinary finite values", "exercised": true, "case_count": 48 }, { "id": "quotient-rounding", "description": "Quotient display rounding / repeating binary64", "exercised": true, "case_count": 126 }, { "id": "quotient-boundary", "description": "Quotient range edges: zero dividend, max safe integer, tiny divisor, unsafe integer tokens", "exercised": true, "case_count": 4 }, { "id": "long-normal", "description": "Long division ordinary integers, zero and non-zero remainder", "exercised": true, "case_count": 30 }, { "id": "long-large-integer", "description": "Long division integers larger than 2^53−1", "exercised": true, "case_count": 34 }, { "id": "long-boundary", "description": "Long division 48-digit product bound and INTEGER_TOO_LONG", "exercised": true, "case_count": 10 }, { "id": "invalid-domain", "description": "Invalid inputs (division by zero, domain, range)", "exercised": true, "case_count": 9 } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "Division a÷b and Euclidean long division" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Independent CPython Fraction, Decimal and integer divmod", "engine": { "name": "CPython", "precision_bits": 53, "independent_of_iut": true, "same_runtime_as_iut": false, "generator_sha256": "46970a86bf99366c3be481e404a66136c677bc99ea856ded324cee279e37994e" } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Independent CPython Fraction, Decimal and integer divmod", "engine": { "name": "CPython", "precision_bits": 53, "independent_of_iut": true, "same_runtime_as_iut": false, "generator_sha256": "46970a86bf99366c3be481e404a66136c677bc99ea856ded324cee279e37994e" } } ] }, "links": { "legacy_evidence": "https://www.calculatorx.com/evidence/math.divide/1.0.7.json", "evidence_page": "https://www.calculatorx.com/evidence/math.divide/1.0.7", "calculator": "https://www.calculatorx.com/calc/math/division", "schema": "https://www.calculatorx.com/developers/cvp/schema/cvp-evidence-1.0.json", "protocol": "https://www.calculatorx.com/developers/cvp/spec/1.0", "manifest": "https://www.calculatorx.com/evidence/math.divide/1.0.7.cvp.json", "manifest_immutable": "https://www.calculatorx.com/evidence/math.divide/1.0.7/2026-10-28.meta-metrics-v2.cvp.json", "manifest_core": "https://www.calculatorx.com/evidence/math.divide/1.0.7/2026-10-28.meta-metrics-v2.e8465f3c7103.cvp.json" }, "disclosure": { "policy": "calculatorx-public-evidence-v1", "full_validation": "private", "representation": "summary" } }