test262 built-ins/Object — 42 (self-contained worklist)

[proggeramlug]

Self-contained worklist — 42 failing. Snapshot 2026-07-01 full sweep (perry 0.5.1209, node v26.3.0). Everything you need is in this issue; no history to read, no re-measure to start.

Object ToObject boxing, assign source-prop error propagation, descriptor edge cases, seal/freeze + proxy. Overlaps #3986. Crate: perry-runtime (object).

Setup (any box)

git clone https://github.com/PerryTS/perry && cd perry
cargo build --release -p perry -p perry-runtime-static -p perry-stdlib-static
git clone --depth 1 https://github.com/tc39/test262 vendor/test262   # checkout test-compat/test262/pinned-sha.txt
# node on PATH (differential oracle). See test-compat/test262/README.md.

Measure/verify: scripts/test262_subset.py --root vendor/test262 --dir built-ins/Object --jobs 8 (the .failures.txt sidecar lists failures; diff before/after for zero-regression).

Failure reasons

n	reason
10	(no output)
5	Uncaught exception: Expected a TypeError to be thrown b
3	[perry] dynamic Function refused (AOT) — 0 arg(s); body
2	Uncaught exception: result !== true
2	Uncaught exception: hasProperty !== true
2	Uncaught exception: obj.prop Expected SameValue(«undefi
2	Uncaught exception: Expected true but got false
1	Uncaught exception: Actual [1, 2, 3] and expected [1, 2
1	Uncaught exception: Actual [0, foo] and expected [0, fo
1	Uncaught exception: Expected SameValue(«undefined», «10
1	Uncaught exception: arrObj.hasOwnProperty("prop") Expec
1	Uncaught exception: Expected SameValue(«undefined», «"d

All 42 failing cases (path — reason)

built-ins/Object/assign/target-Array.js    Uncaught exception: Actual [1, 2, 3] and expected [1, 2] should have the same co
built-ins/Object/create/15.2.3.5-4-15.js    Uncaught exception: result !== true
built-ins/Object/create/properties-arg-to-object-non-empty-string.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Object/defineProperties/15.2.3.7-2-16.js    Uncaught exception: result !== true
built-ins/Object/defineProperties/15.2.3.7-6-a-150.js    (no output)
built-ins/Object/defineProperties/15.2.3.7-6-a-151.js    (no output)
built-ins/Object/defineProperties/15.2.3.7-6-a-17.js    Uncaught exception: hasProperty !== true
built-ins/Object/defineProperties/15.2.3.7-6-a-20.js    Uncaught exception: hasProperty !== true
built-ins/Object/defineProperties/proxy-no-ownkeys-returned-keys-order.js    Uncaught exception: Actual [0, foo] and expected [0, foo, Symbol()] should have 
built-ins/Object/defineProperty/15.2.3.6-4-116.js    (no output)
built-ins/Object/defineProperty/15.2.3.6-4-154.js    (no output)
built-ins/Object/defineProperty/15.2.3.6-4-155.js    (no output)
built-ins/Object/defineProperty/15.2.3.6-4-243-2.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Object/defineProperty/15.2.3.6-4-410.js    Uncaught exception: Expected SameValue(«undefined», «1001») to be true
built-ins/Object/defineProperty/15.2.3.6-4-417.js    Uncaught exception: obj.prop Expected SameValue(«undefined», «1001») to be true
built-ins/Object/defineProperty/15.2.3.6-4-579.js    Uncaught exception: arrObj.hasOwnProperty("prop") Expected SameValue(«true», «fa
built-ins/Object/defineProperty/15.2.3.6-4-586.js    Uncaught exception: Expected SameValue(«undefined», «"data"») to be true
built-ins/Object/defineProperty/15.2.3.6-4-593.js    Uncaught exception: obj.prop Expected SameValue(«undefined», «"data"») to be tru
built-ins/Object/defineProperty/15.2.3.6-4-594.js    Uncaught exception: obj.hasOwnProperty("prop") Expected SameValue(«true», «false
built-ins/Object/defineProperty/15.2.3.6-4-596.js    Uncaught exception: Expected SameValue(«"unlikelyValue"», «"data"») to be true
built-ins/Object/defineProperty/15.2.3.6-4-625gs.js    Uncaught exception: this.prop should take precedence over Object.prototype.prop
built-ins/Object/defineProperty/symbol-data-property-default-strict.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Object/entries/observable-operations.js    (no output)
built-ins/Object/freeze/frozen-object-contains-symbol-properties-strict.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Object/getOwnPropertyDescriptors/observable-operations.js    Uncaught exception: log Expected SameValue(«"|ownKeys|getOwnPropertyDescriptor:a
built-ins/Object/getOwnPropertySymbols/order-after-define-property.js    Uncaught exception: Actual [Symbol(b), Symbol(a)] and expected [Symbol(a), Symbo
built-ins/Object/internals/DefineOwnProperty/consistent-writable-regexp-dollar1.js    TypeError: Cannot read properties of undefined (reading 'writable')
built-ins/Object/isExtensible/15.2.3.13-2-13.js    Uncaught exception: e Expected SameValue(«false», «true») to be true
built-ins/Object/preventExtensions/15.2.3.10-3-13.js    Uncaught exception: Expected true but got false
built-ins/Object/preventExtensions/15.2.3.10-3-3.js    Uncaught exception: Expected true but got false
built-ins/Object/preventExtensions/symbol-object-contains-symbol-properties-strict.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Object/prototype/S15.2.4_A1_T2.js    Uncaught exception: The result of evaluating (e instanceof TypeError) is expecte
built-ins/Object/prototype/S15.2.4_A4.js    Uncaught exception: `new Object.prototype` throws a TypeError exception Expected
built-ins/Object/prototype/isPrototypeOf/arg-is-proxy.js    (no output)
built-ins/Object/prototype/toLocaleString/S15.2.4.3_A1.js    (no output)
built-ins/Object/prototype/toLocaleString/primitive_this_value_getter.js    Uncaught exception: Expected SameValue(«"object"», «"boolean"») to be true
built-ins/Object/seal/seal-arrowfunction.js    [perry] dynamic Function refused (AOT) — 0 arg(s); body[..160]=""
built-ins/Object/seal/seal-asyncarrowfunction.js    [perry] dynamic Function refused (AOT) — 0 arg(s); body[..160]=""
built-ins/Object/seal/seal-asyncfunction.js    [perry] dynamic Function refused (AOT) — 0 arg(s); body[..160]=""
built-ins/Object/setPrototypeOf/success.js    TypeError: Cannot convert undefined or null to object
built-ins/Object/values/observable-operations.js    (no output)
built-ins/Object/values/order-after-define-property.js    (no output)

Workflow

Pick a coherent single-root subcluster, localize (cargo run --release -- f.ts --trace hir --focus <fn> / --trace llvm), fix, verify listed cases pass AND re-run the slice for zero regressions. Code-only PR (no Cargo.toml/Cargo.lock version bump, no CLAUDE.md Current-Version, no CHANGELOG — maintainer folds metadata). cargo fmt --all -- --check + bash scripts/check_file_size.sh must pass (files < 2000 lines). Reference this issue. Never reference internal infrastructure hostnames.