Parent: #134 Profile umbrella: #140 Home inventory: #163 Bun inventory: #164 Builds on: #215 and #216
Implement the pinned private-JSC symbol:
JSC__JSValue__createUninitializedUint8Array
Acceptance criteria:
- Return a live ordinary (non-Buffer) Uint8Array in the selected realm with the exact requested length.
- Allocate genuinely uninitialized backing storage instead of routing through the normal ECMAScript zero-filled constructor path.
- Keep uninitialized allocation internal to this explicit ABI; ordinary JavaScript typed-array construction remains zero-filled.
- Reject oversized lengths through the private pending RangeError/OOM boundary without publishing a partial object.
- Preserve GC byte accounting, alignment, finalization, and leak behavior for both arena and GC-backed contexts.
- Focused tests and the Home consumer fixture verify type/length, writable independent storage, ordinary Uint8Array identity, failure behavior, and public accessor compatibility without asserting nondeterministic initial bytes.
- Inventories, ABI docs, README scorecard, and parent trackers publish the verified counts; benchmark results change only if a committed benchmark path is rerun.
Completed evidence
Implemented in 6662df91 and documented in 4554eeb3. The focused test passed 3/3 with zero leaks; the batched engine/consumer/audit gate passed 15/15; the Home consumer fixture passed 196/196. Home is 197/431 implemented (234 pending), Bun core is 191/421 (230 pending), and the public classifier reports 117 public, 19 extensions, and 201 private/support exports.