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879ac36e45
Cache the flattened enumerable key snapshot for each `for..in` site and reuse a `PropertyNameIterator` when the receiver shape, dictionary generation, indexed storage kind and length, prototype chain validity, and magical-length state still match. Handle packed indexed receivers as well as plain named-property objects. Teach `ObjectPropertyIteratorNext` in `asmint.asm` to return cached property values directly and to fall back to the slow iterator logic when any guard fails. Treat arrays' hidden non-enumerable `length` property as a visited name for for-in shadowing, and include the receiver's magical-length state in the cache key so arrays and plain objects do not share snapshots. Add `test-js` and `test-js-bytecode` coverage for mixed numeric and named keys, packed receiver transitions, re-entry, iterator reuse, GC retention, array length shadowing, and same-site cache reuse. |
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