Zachary D. Rowitsch f20c0c771e Implement Symbol, WeakMap, and Proxy with comprehensive test coverage ...

Add three foundational ES2015 features to the JS engine:

- Symbol: unique identity values, well-known symbols (iterator, toPrimitive,
  hasInstance, toStringTag, species, isConcatSpreadable), Symbol.for/keyFor
  registry, symbol-keyed properties, coercion guards, and computed member
  access support.

- WeakMap: object-keyed map with get/set/has/delete, TypeError for
  non-object keys, and proper prototype chain setup.

- Proxy: get/set/has/deleteProperty/ownKeys/apply/construct traps,
  Proxy.revocable with internal revoke slot, and function proxy support.

Also fixes 14 code review issues including: template literal Symbol TypeError
propagation, abstract equality for symbols, comparison/arithmetic TypeError
guards, delete on symbol-keyed properties, Symbol.iterator support in
destructuring and for-of, and replacement of __proxy__/__target_fn__ sentinel
properties with proper internal slots.

Box JsFunction inside JsValue enum to reduce enum size from ~200 to ~48 bytes,
fixing stack overflow in deep recursion tests caused by accumulated frame bloat.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-25 11:08:36 -05:00

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