diff --git a/benchmarks/native_property_get/README.md b/benchmarks/native_property_get/README.md
new file mode 100644
index 0000000000..3452726bde
--- /dev/null
+++ b/benchmarks/native_property_get/README.md
@@ -0,0 +1,49 @@
+# Native property Get probes
+
+These probes accompany the 2026-09-14 native-side property Get brief. They
+separate positive own/prototype reads from non-regex iterator, promise, and
+JSON work. Each program checks its result; the runner also compares stdout
+with the repository's pinned Node version and rejects an empty result.
+
+Build the compiler and both static wrappers from the same checkout and
+package set. Use an isolated target directory/worktree for each concurrent
+build. For the Linux instruction comparison:
+
+```sh
+CARGO_PROFILE_RELEASE_CODEGEN_UNITS=16 \
+CARGO_PROFILE_RELEASE_DEBUG=1 CARGO_PROFILE_RELEASE_STRIP=none \
+cargo build --release --locked -j4 \
+  -p perry -p perry-runtime-static -p perry-stdlib-static
+python3 benchmarks/native_property_get/measure.py \
+  --runtime-dir target/release --out /absolute/path/to/new-results \
+  --node /path/to/node-v26.5.1/bin/node
+```
+
+The output directory must be new. The runner records the source commit,
+compiler/archive/probe SHA-256 hashes, three `instructions:u` counts,
+instruction-sampled DWARF call stacks, period-weighted folded stacks, and
+inclusive Get attribution. Nested Get frames count once in the inclusive
+share. Shares are sampling estimates; the stat counts are the performance
+comparison. `--debug-symbols` is required when compiling the probes, and
+`--no-auto-optimize` pins the runtime archives. LLVM's addr2line is selected
+locally when available so host binutils does not choke on runtime DWARF.
+
+`--smoke` compiles every probe, runs 100 iterations, and compares with Node
+without requiring Linux perf. A zero Get attribution is rejected: it can
+indicate stripped symbols or a probe that did not exercise the intended path.
+
+The iterator reuses its result object. It avoids large retained arrays and
+therefore does not depend on resolving the concurrent #10215 investigation.
+The thenable and toJSON probes use positive lookups because main already
+optimizes many negative probes for those names.
+
+Measured results, scope, and validation are in [REPORT.md](REPORT.md). To replay
+the fault injections with no other builds reading this worktree:
+
+```sh
+python3 benchmarks/native_property_get/faults.py --out /absolute/path/to/new-fault-results
+```
+
+The three mutants must fail their named test assertions, and restored sources
+must pass the eight focused tests. The GC custody inventory classifies the
+forced-slow boolean as test-only; production binaries contain no switch.
diff --git a/benchmarks/native_property_get/REPORT.md b/benchmarks/native_property_get/REPORT.md
new file mode 100644
index 0000000000..614dc6217f
--- /dev/null
+++ b/benchmarks/native_property_get/REPORT.md
@@ -0,0 +1,137 @@
+# Native-side property Get: measured ordinary-data path
+
+Base: `9fda98df68d9fac3c08b2385fae007aa9f5278df` (main, 0.5.1563).
+Date: 2026-09-14. Measurements: Linux x86_64, perrymaster, AMD Ryzen 7 7700X.
+
+## Change and safety boundary
+
+`Reflect.get`, the named-field ABI, and the native borrowed-name getter share
+an inlinable positive lookup. It classifies the pointer once per chain link,
+requires an arena-backed GC object with an ordinary shape and an admitted
+ordinary class ID, checks the accessor-key Bloom summary, then reads the
+current shape's own data slot. It follows explicit ordinary prototypes or
+already-rooted synthetic class prototype pointers for at most 32 links.
+It does not infer absence: every unproven case falls through to the original
+Get implementation. Keys remain borrowed throughout this callback-free,
+JS-allocation-free lookup; the consult-only keys index cannot build or collect.
+
+No new GC roots or pointer caches are introduced. The `toJSON` caller retains
+its handle scope, reuses the rooted canonical key, and uses the new canonical
+key Get API. Default builtin prototype resolution remains on the slow path:
+it can initialize objects and observe replacement through globalThis.
+
+Own/prototype accessors, proxies, private-looking names, `constructor`, declared
+classes, process.env, mapped arguments, element-bearing objects, and native
+exotics decline. In particular, RegExp expandos and `lastIndex` still use the
+existing exotic handler. Inherited null/undefined values conservatively decline
+to preserve the current slow resolver's behavior. A distinct Reflect receiver
+can use a data hit because no getter or receiver binding is observed.
+
+This deliberately limits the optimization to ordinary data reads. The measured
+improvement does not require exotic bypasses, new per-realm builtin pointers,
+or a per-call-site cache. Remaining hot costs include class-ID membership and
+prototype registries; those have separate invalidation and collision rules.
+
+## Instruction evidence
+
+The base workloads were measured before runtime edits. All five programs check
+their checksum and match pinned Node 26.5.1 stdout. Both builds use the same
+checkout base, package set, release codegen-units=16, debug=1, strip=none, and
+repository unwind/frame-pointer flags. Probe compilation uses
+`--no-auto-optimize --debug-symbols` and an explicit `PERRY_RUNTIME_DIR`.
+The table uses medians of three `perf stat -e instructions:u` runs, including
+startup. It makes no shared-host wall-clock speed claim.
+
+| Workload | Iterations | Base instructions | Candidate instructions | Reduction | Inclusive Get share, base → candidate |
+|---|---:|---:|---:|---:|---:|
+| `reflect_own` | 200,000 | 498,582,567 | 143,385,957 | 71.24% | 98.80% → 97.20% |
+| `reflect_proto` | 200,000 | 1,369,594,468 | 305,995,648 | 77.66% | 98.90% → 99.35% |
+| `iterator` | 200,000 | 886,642,572 | 886,162,527 | 0.05% | 0.68% → 0.79% |
+| `thenable` | 20,000 | 365,634,266 | 320,441,221 | 12.36% | 15.50% → 2.66% |
+| `tojson` | 100,000 | 742,646,720 | 423,858,278 | 42.93% | 50.71% → 28.22% |
+
+`iterator` is a user `for…of` iterator that reuses its result object: generic
+Get is under 1% of the baseline, so the neutral result is expected. Positive
+thenable assimilation and inherited `toJSON` expose the runtime cost clearly.
+The synthetic Reflect probes cover own data and two prototype links.
+
+Attribution uses `perf record -e instructions:u -c 500003 --call-graph
+dwarf,16384 -m 64M --no-buildid --no-buildid-cache`, then `perf script --no-inline`.
+All ten final profiles reported no lost samples. Folded stacks are weighted by
+sample period, and nested Get frames count once in the inclusive share. Shares
+are sampling estimates, especially the small iterator share. An earlier smaller
+sampling buffer dropped samples; those attribution runs are excluded here.
+
+The JSON files in `evidence/` record all counts, shares, top inclusive-Get leaf
+symbols, probe/binary hashes, and compiler/runtime archive hashes. The compressed
+`measurement-receipts.tar.gz` contains raw stat rows, checked stdout, final
+folded stacks, perf record logs, and the measured candidate source patch.
+The patch records the pre-commit source snapshot; later evidence and harness
+reporting edits do not change the measured runtime. Full perf data and linked
+probe binaries remain under `/root/native-property-get/` on perrymaster.
+
+## Correctness and fault injection
+
+Eight Rust tests compare ordinary reads against a forced slow path and cover
+all value kinds, prototype mutation, shadow/delete/freeze, own and inherited
+getters, setter-only descriptors, proxies, class statics, private-looking keys,
+arrays, Buffer, mapped arguments, RegExp expandos/accessors, long keys, and
+spilled/deleted shape slots. Getter counts assert one invocation per Get.
+`test-files/test_gap_native_property_get.ts` adds 42 lines of checked parity output,
+including distinct receivers, proxy traps/revocation, key-conversion order,
+symbols, class/private syntax, Date, typed arrays, and RegExp.
+
+The test-only forced-slow switch is thread-local; it cannot affect production.
+`faults.py` runs healthy tests before and after each serial source-mutation
+campaign, restores source files in `finally`, and requires a named assertion
+failure (a compile failure does not count). All three mutations were killed by named assertion failures (exit 101):
+
+| Mutation | Failing test |
+|---|---|
+| Force every classified Get to decline | `own_data_is_served_and_matches_forced_slow_for_all_value_kinds` |
+| Ignore the accessor Bloom guard | `accessor_bloom_guard_preserves_own_and_inherited_getter_calls` |
+| Ignore RegExp own `value` expandos in the fallback | `regexp_expandos_and_accessors_remain_on_the_exotic_path` |
+
+The last mutation exercises the preserved exotic fallback; this change adds no
+exotic fast path. The restored eight-test suite passed before and after the
+campaign. See `evidence/faults.json` and `fault-logs.tar.gz`.
+
+## Validation
+
+- Full runtime unit suite: 3,803 passed, 4 ignored, 0 failed, single-threaded.
+  Base suite: 3,795 passed, 4 ignored; the known native-stack test passed here.
+- `cargo check -p perry-runtime --no-default-features --features full`: passed.
+- Clippy all-target diagnostics compared with the captured base: no additions
+  or removals after normalizing shifted line numbers. Both runs retain the same
+  12 pre-existing `approx_constant` errors; see `evidence/clippy-diff.json`.
+- `cargo fmt --all --check`, `git diff --check`, and Python syntax checks passed.
+- The final measurement harness smoke test passed all five programs on Linux.
+  The 42-line parity program matches Node on both base and candidate.
+- The final full lint replay ran both script and compile tiers: 80 of 83
+  commands passed, with three existing failures and two CI-only skips. A new test-only
+  boolean initially required a custody verdict; the explicit `test_only` entry
+  fixes that failure, with no added pointer debt. The script-tier replay passes
+  every executable gate except the pre-existing public benchmark freshness red.
+  The compile tier also exposes pre-existing unused WebAssembly helpers, an existing test cache assignment, and API
+  docs drift (`bun-pty`). The unused-helper failures reproduce on a clean base
+  worktree. All ten API-manifest source files are byte-identical to base, and
+  the generated diff is saved. See `evidence/base-gate-comparison.json`.
+- GC ratchet: all 14 probes match Node, with seven measured repetitions and two
+  trace passes on both base and candidate. All 126 shared-CI metric medians
+  (including the probe-specific exclusions) are exactly identical. The checker
+  passes against a fresh same-host base artifact. The repository's older pinned
+  artifact fails on both base and candidate; it was not changed or re-pinned.
+  See `evidence/gc-ratchet-ab.json` and the raw GC receipts.
+- GC stress: all 86 corpus programs ran across seven PR arms: 428 PASS, 167
+  UNVER (output matched but that arm did not collect), 7 FAIL. Every required
+  arm passes aggregate liveness. All seven failures are the HTTP/2 pending-event
+  callback fixture. A fresh-base replay reproduces all seven failures with
+  byte-identical evidence strings and collector counters. See
+  `evidence/gc-stress-base-http2.json` and `gc-stress-receipts.tar.gz`. The
+  single-fixture replay has inert arms as expected; the full candidate corpus
+  satisfies every arm's liveness requirement.
+
+Main advanced to `eb13fa188d` while this work was validated, including separate
+GC and HTTP fixes. The measurements and A/B receipts deliberately remain on
+`9fda98df68`; the merge train must replay the combined tree. This branch does
+not absorb or rebaseline those independent changes.
diff --git a/benchmarks/native_property_get/evidence/api-docs-drift.patch.gz b/benchmarks/native_property_get/evidence/api-docs-drift.patch.gz
new file mode 100644
index 0000000000..2914094f81
Binary files /dev/null and b/benchmarks/native_property_get/evidence/api-docs-drift.patch.gz differ
diff --git a/benchmarks/native_property_get/evidence/base-gate-comparison.json b/benchmarks/native_property_get/evidence/base-gate-comparison.json
new file mode 100644
index 0000000000..8aa96cceb5
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/base-gate-comparison.json
@@ -0,0 +1,40 @@
+{
+  "base_commit": "9fda98df68d9fac3c08b2385fae007aa9f5278df",
+  "warnings": {
+    "base": [
+      "error: function `registered_extern_handle` is never used",
+      "error: function `wasm_memory_descriptor_maximum` is never used"
+    ],
+    "candidate": [
+      "error: function `registered_extern_handle` is never used",
+      "error: function `wasm_memory_descriptor_maximum` is never used"
+    ],
+    "base_test_warnings": [
+      "warning: value assigned to `cache` is never read",
+      "warning: function `register_extern_wrapper` is never used",
+      "warning: function `registered_extern_handle` is never used",
+      "warning: function `wasm_memory_descriptor_maximum` is never used"
+    ],
+    "candidate_test_warnings": [
+      "warning: value assigned to `cache` is never read",
+      "warning: function `register_extern_wrapper` is never used",
+      "warning: function `registered_extern_handle` is never used",
+      "warning: function `wasm_memory_descriptor_maximum` is never used"
+    ]
+  },
+  "api_manifest_source_identical": true,
+  "api_manifest_files": [
+    "crates/perry-api-manifest/Cargo.toml",
+    "crates/perry-api-manifest/src/emit.rs",
+    "crates/perry-api-manifest/src/entries.rs",
+    "crates/perry-api-manifest/src/entries/part_1.rs",
+    "crates/perry-api-manifest/src/entries/part_2.rs",
+    "crates/perry-api-manifest/src/entries/part_3.rs",
+    "crates/perry-api-manifest/src/entries/part_4.rs",
+    "crates/perry-api-manifest/src/lib.rs",
+    "crates/perry-api-manifest/src/native_abi.rs",
+    "crates/perry-api-manifest/tests/stub_inventory.rs"
+  ],
+  "api_docs_drift": "Generated docs add bun-pty from unchanged manifest; saved in api-docs-drift.patch.gz.",
+  "public_freshness_base": "public baseline error: public artifact benchmark inputs changed; regenerate it with ./benchmarks/run_public_baseline.sh"
+}
diff --git a/benchmarks/native_property_get/evidence/baseline-build.json b/benchmarks/native_property_get/evidence/baseline-build.json
new file mode 100644
index 0000000000..d24f64d7e8
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/baseline-build.json
@@ -0,0 +1,16 @@
+{
+  "commit": "9fda98df68d9fac3c08b2385fae007aa9f5278df",
+  "node": "v26.5.1",
+  "artifacts": {
+    "perry": "5c3d79c951b6d10ebb394f01d8e4258445567433060e025a900a58eb79c15f71",
+    "libperry_runtime.a": "d4d6cfef4cc9c076fb00dedf99c56b5be9cab5f4a4813c1b097fd41f47ff18b6",
+    "libperry_stdlib.a": "871746c24fbedff2fc2076fec4ae598a38a79efabdff96ab1cec835457ff2203"
+  },
+  "probes": {
+    "reflect_own": "be47a8c4951b74b7eb1303afd1b02ed929b954f485cf7f0d10194968c1f29cba",
+    "reflect_proto": "45e82bd599efdcff78032103ec31d87ad087afdf7bdc7438b4abf91142b8b2c3",
+    "iterator": "da8ac63a3918d5aede6185b823e94d896dab89327a2b2718278a8355df1240a4",
+    "thenable": "f418d2de753b6baef4d2cad9fba2dd7d41d44e460f9da74fad84778b0c6374ec",
+    "tojson": "139928fda9c0e8f2c2d1a38feb4ac8f18ef14d8dad13114b325b06650e2155e0"
+  }
+}
diff --git a/benchmarks/native_property_get/evidence/baseline.json b/benchmarks/native_property_get/evidence/baseline.json
new file mode 100644
index 0000000000..e1cc3171d9
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/baseline.json
@@ -0,0 +1,428 @@
+{
+  "reflect_own": {
+    "iterations": 200000,
+    "instructions": [
+      498582567,
+      498582572,
+      498582459
+    ],
+    "median": 498582567,
+    "get_inclusive_percent": 98.79518072289157,
+    "get_leaf_percent_of_program": [
+      [
+        "js_reflect_get",
+        12.951807228915662
+      ],
+      [
+        "js_object_get_field_by_name",
+        10.943775100401606
+      ],
+      [
+        "perry_runtime::object::field_get_set::get_field_by_name_tail::get_field_by_name_object_tail",
+        9.337349397590362
+      ],
+      [
+        "perry_runtime::object::class_registry::parent_static::is_class_object_ptr",
+        9.337349397590362
+      ],
+      [
+        "js_to_primitive",
+        9.036144578313253
+      ],
+      [
+        "<perry_runtime::string::OwnedStringBytes>::copy_of_key",
+        4.216867469879518
+      ],
+      [
+        "perry_runtime::async_hooks::is_async_resource_handle",
+        4.116465863453815
+      ],
+      [
+        "core::str::converts::from_utf8",
+        3.6144578313253013
+      ],
+      [
+        "perry_runtime::closure::dynamic_props::is_closure_ptr",
+        2.8112449799196786
+      ],
+      [
+        "perry_runtime::object::arguments::is_arguments_object",
+        2.710843373493976
+      ],
+      [
+        "perry_runtime::proxy::target_get_property_key",
+        2.710843373493976
+      ],
+      [
+        "perry_runtime::object::shapes::shape_live_inline_slot_count_by_id",
+        2.710843373493976
+      ],
+      [
+        "perry_runtime::object::class_meta_registry::get_parent_class_id",
+        2.610441767068273
+      ],
+      [
+        "perry_runtime::buffer::header::is_registered_buffer",
+        2.108433734939759
+      ],
+      [
+        "perry_runtime::object::field_get_set::has_property::closure_dynamic_prop_by_key",
+        1.7068273092369477
+      ],
+      [
+        "perry_runtime::proxy::reflect_value_is_object",
+        1.7068273092369477
+      ],
+      [
+        "perry_runtime::temporal::is_temporal_cell_addr",
+        1.5060240963855422
+      ],
+      [
+        "perry_runtime::typedarray_props::typed_array_addr_from_value",
+        1.5060240963855422
+      ],
+      [
+        "perry_runtime::date::is_date_cell_addr",
+        1.5060240963855422
+      ],
+      [
+        "trunc",
+        1.104417670682731
+      ]
+    ],
+    "sampled_instructions": 498002988,
+    "binary_sha256": "e2c4b05f839d026a5c5f5bd3d49f5e647855b1f45a23a5c49d0f04fd179b9082"
+  },
+  "reflect_proto": {
+    "iterations": 200000,
+    "instructions": [
+      1369594500,
+      1369593934,
+      1369594468
+    ],
+    "median": 1369594468,
+    "get_inclusive_percent": 98.90470974808325,
+    "get_leaf_percent_of_program": [
+      [
+        "perry_runtime::object::class_meta_registry::get_parent_class_id",
+        16.502373128879153
+      ],
+      [
+        "js_object_get_field_by_name",
+        10.076670317634173
+      ],
+      [
+        "perry_runtime::object::class_registry::state::class_decl_prototype_object",
+        7.6305220883534135
+      ],
+      [
+        "perry_runtime::object::field_get_set::get_field_by_name_tail::get_field_by_name_object_tail",
+        7.484483388097846
+      ],
+      [
+        "js_reflect_get",
+        4.490690032858708
+      ],
+      [
+        "perry_runtime::object::class_registry::prototype_objects::resolve_proto_chain_field_inner",
+        4.417670682730924
+      ],
+      [
+        "core::str::converts::from_utf8",
+        3.833515881708653
+      ],
+      [
+        "perry_runtime::async_hooks::is_async_resource_handle",
+        3.687477181453085
+      ],
+      [
+        "perry_runtime::closure::dynamic_props::is_closure_ptr",
+        3.4684191310697337
+      ],
+      [
+        "trunc",
+        2.9937933552391383
+      ],
+      [
+        "perry_runtime::object::arguments::is_arguments_object",
+        2.8112449799196786
+      ],
+      [
+        "perry_runtime::object::class_registry::parent_static::is_class_object_ptr",
+        2.7747353048557866
+      ],
+      [
+        "perry_runtime::buffer::header::is_registered_buffer",
+        2.701715954728003
+      ],
+      [
+        "<perry_runtime::string::OwnedStringBytes>::copy_of_key",
+        2.701715954728003
+      ],
+      [
+        "perry_runtime::temporal::is_temporal_cell_addr",
+        2.701715954728003
+      ],
+      [
+        "js_to_primitive",
+        2.3366192040890836
+      ],
+      [
+        "perry_runtime::proxy::reflect_value_is_object",
+        1.8985031033223805
+      ],
+      [
+        "perry_runtime::object::class_registry::prototype_objects::class_prototype_object",
+        1.8619934282584885
+      ],
+      [
+        "perry_runtime::object::prototype_chain::meta_capable_object",
+        1.3508579773640015
+      ],
+      [
+        "perry_runtime::closure::dynamic_props::closure_get_dynamic_prop",
+        1.3143483023001095
+      ]
+    ],
+    "sampled_instructions": 1369508217,
+    "binary_sha256": "6defa98c303cff2f955b8611a71b528144ff0697d7c6d4f041cbd10f7f63025b"
+  },
+  "iterator": {
+    "iterations": 200000,
+    "instructions": [
+      886642572,
+      886643407,
+      886642216
+    ],
+    "median": 886642572,
+    "get_inclusive_percent": 0.676818950930626,
+    "get_leaf_percent_of_program": [
+      [
+        "perry_runtime::object::field_get_set::get_field_by_name_tail::get_field_by_name_object_tail",
+        0.11280315848843768
+      ],
+      [
+        "perry_runtime::object::prototype_chain::meta_capable_object",
+        0.11280315848843768
+      ],
+      [
+        "perry_runtime::object::class_registry::parent_static::is_class_object_ptr",
+        0.11280315848843768
+      ],
+      [
+        "mi_free",
+        0.05640157924421884
+      ],
+      [
+        "js_array_get_f64",
+        0.05640157924421884
+      ],
+      [
+        "js_object_get_field_by_name",
+        0.05640157924421884
+      ],
+      [
+        "perry_runtime::object::field_get_set::accessors::array_subclass_prototype_field",
+        0.05640157924421884
+      ],
+      [
+        "__memmove_avx512_unaligned_erms",
+        0.05640157924421884
+      ],
+      [
+        "<alloc::string::String>::from_utf8_lossy",
+        0.05640157924421884
+      ]
+    ],
+    "sampled_instructions": 886505319,
+    "binary_sha256": "46bc863ba75b118f1193d2a3fb4cfc22c1deb50ab23a56f58b573b217b62bb50"
+  },
+  "thenable": {
+    "iterations": 20000,
+    "instructions": [
+      365635735,
+      365634266,
+      365626025
+    ],
+    "median": 365634266,
+    "get_inclusive_percent": 15.500685871056241,
+    "get_leaf_percent_of_program": [
+      [
+        "perry_runtime::object::field_get_set::get_field_by_name_tail::get_field_by_name_object_tail",
+        1.7832647462277091
+      ],
+      [
+        "js_object_get_field_by_name",
+        1.7832647462277091
+      ],
+      [
+        "perry_runtime::object::object_ops::keys_array::own_key_present",
+        1.0973936899862826
+      ],
+      [
+        "js_dynamic_object_get_property",
+        0.9602194787379973
+      ],
+      [
+        "perry_runtime::object::class_meta_registry::get_parent_class_id",
+        0.823045267489712
+      ],
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+}
diff --git a/benchmarks/native_property_get/evidence/candidate-build.json b/benchmarks/native_property_get/evidence/candidate-build.json
new file mode 100644
index 0000000000..c2ccb129d7
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/candidate-build.json
@@ -0,0 +1,17 @@
+{
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+  "node": "v26.5.1",
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+    "libperry_stdlib.a": "66b042e43daa18f116074ce891ddd93ac8cff8f4055dfb11bbb3a69291b665ed"
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+    "tojson": "139928fda9c0e8f2c2d1a38feb4ac8f18ef14d8dad13114b325b06650e2155e0"
+  }
+}
diff --git a/benchmarks/native_property_get/evidence/candidate.json b/benchmarks/native_property_get/evidence/candidate.json
new file mode 100644
index 0000000000..1a04a75ddb
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/candidate.json
@@ -0,0 +1,280 @@
+{
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diff --git a/benchmarks/native_property_get/evidence/clippy-diff.json b/benchmarks/native_property_get/evidence/clippy-diff.json
new file mode 100644
index 0000000000..f68ac0546f
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/clippy-diff.json
@@ -0,0 +1,8 @@
+{
+  "comparison": "9fda98df68 vs candidate; cargo clippy -j4 -p perry-runtime --all-targets --message-format=json",
+  "normalization": "level, code, message, primary filenames; ignores shifted line numbers",
+  "baseline_diagnostics": 1987,
+  "candidate_diagnostics": 1987,
+  "new_diagnostics": [],
+  "removed_diagnostics": []
+}
diff --git a/benchmarks/native_property_get/evidence/clippy-logs.tar.gz b/benchmarks/native_property_get/evidence/clippy-logs.tar.gz
new file mode 100644
index 0000000000..0d107143f9
Binary files /dev/null and b/benchmarks/native_property_get/evidence/clippy-logs.tar.gz differ
diff --git a/benchmarks/native_property_get/evidence/fault-logs.tar.gz b/benchmarks/native_property_get/evidence/fault-logs.tar.gz
new file mode 100644
index 0000000000..db00b7a9fe
Binary files /dev/null and b/benchmarks/native_property_get/evidence/fault-logs.tar.gz differ
diff --git a/benchmarks/native_property_get/evidence/faults.json b/benchmarks/native_property_get/evidence/faults.json
new file mode 100644
index 0000000000..b76475a1b2
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/faults.json
@@ -0,0 +1,20 @@
+[
+  {
+    "mutation": "fast_path_removed",
+    "test": "object::native_get::tests::own_data_is_served_and_matches_forced_slow_for_all_value_kinds",
+    "exit_code": 101,
+    "assertion_failed": true
+  },
+  {
+    "mutation": "accessor_guard_removed",
+    "test": "object::native_get::tests::accessor_bloom_guard_preserves_own_and_inherited_getter_calls",
+    "exit_code": 101,
+    "assertion_failed": true
+  },
+  {
+    "mutation": "exotic_expando_ignored",
+    "test": "object::native_get::tests::regexp_expandos_and_accessors_remain_on_the_exotic_path",
+    "exit_code": 101,
+    "assertion_failed": true
+  }
+]
diff --git a/benchmarks/native_property_get/evidence/gc-base-runtime.sha256 b/benchmarks/native_property_get/evidence/gc-base-runtime.sha256
new file mode 100644
index 0000000000..51a2460b2c
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/gc-base-runtime.sha256
@@ -0,0 +1,3 @@
+fa2df7f3d54bd25eab5e730c3e9ba27549ec980cb146f3ff35c946bd6f8dabcf  /root/native-property-get/base-runtime/libperry_runtime.a
+70e7bb414429841a2c5b6b99d8013eb7943b5f8f2ca92fea62d77288569d078b  /root/native-property-get/base-runtime/libperry_stdlib.a
+57778c1bc33a8367ef6e8d0ea0993e61c2d387020a13ed0bc802a90eceeee09e  /root/native-property-get/base-runtime/perry
diff --git a/benchmarks/native_property_get/evidence/gc-ratchet-ab.json b/benchmarks/native_property_get/evidence/gc-ratchet-ab.json
new file mode 100644
index 0000000000..e7d214604b
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/gc-ratchet-ab.json
@@ -0,0 +1,1016 @@
+{
+  "base_commit": "9fda98df68d9fac3c08b2385fae007aa9f5278df",
+  "profile": "shared_ci",
+  "correctness": "14/14 match Node on base and candidate",
+  "all_gated_medians_identical": true,
+  "rows": [
+    {
+      "probe": "01_nursery_churn",
+      "metric": "heap_used_bytes",
+      "base_median": 438744,
+      "candidate_median": 438744,
+      "base_spread": 0,
+      "candidate_spread": 0
+    },
+    {
+      "probe": "01_nursery_churn",
+      "metric": "heap_total_bytes",
+      "base_median": 14680064,
+      "candidate_median": 14680064,
+      "base_spread": 0,
+      "candidate_spread": 0
+    },
+    {
+      "probe": "01_nursery_churn",
+      "metric": "minor_cycles",
+      "base_median": 1,
+      "candidate_median": 1,
+      "base_spread": 0,
+      "candidate_spread": 0
+    },
+    {
+      "probe": "01_nursery_churn",
+      "metric": "step_cycles",
+      "base_median": 1,
+      "candidate_median": 1,
+      "base_spread": 0,
+      "candidate_spread": 0
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+    {
+      "probe": "01_nursery_churn",
+      "metric": "copied_objects",
+      "base_median": 6690,
+      "candidate_median": 6690,
+      "base_spread": 0,
+      "candidate_spread": 0
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+      "base_median": 466392,
+      "candidate_median": 466392,
+      "base_spread": 0,
+      "candidate_spread": 0
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+    {
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+      "candidate_median": 0,
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diff --git a/benchmarks/native_property_get/evidence/gc-ratchet-receipts.tar.gz b/benchmarks/native_property_get/evidence/gc-ratchet-receipts.tar.gz
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new file mode 100644
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+++ b/benchmarks/native_property_get/evidence/gc-stress-base-http2.json
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diff --git a/benchmarks/native_property_get/evidence/gc-stress-receipts.tar.gz b/benchmarks/native_property_get/evidence/gc-stress-receipts.tar.gz
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evacuated=0 scavenged=7 reclaimed=3148344"},{"test":"test_gap_gc_string_copy_source_rooting","arm":"safepoint_minor","result":"PASS","cycles":1,"evacuated":0,"scavenged":7,"reclaimed":3148344,"evidence":"cycles=1 evacuated=0 scavenged=7 reclaimed=3148344"},{"test":"test_gap_gc_string_copy_source_rooting","arm":"evac_minor","result":"PASS","cycles":1,"evacuated":0,"scavenged":7,"reclaimed":3148344,"evidence":"cycles=1 evacuated=0 scavenged=7 reclaimed=3148344"},{"test":"test_gap_gc_string_copy_source_rooting","arm":"verify_evac","result":"PASS","cycles":1,"evacuated":0,"scavenged":7,"reclaimed":3148344,"evidence":"cycles=1 evacuated=0 scavenged=7 reclaimed=3148344"},{"test":"test_gap_gc_string_copy_source_rooting","arm":"force_verify","result":"PASS","cycles":1,"evacuated":0,"scavenged":7,"reclaimed":3148344,"evidence":"cycles=1 evacuated=0 scavenged=7 reclaimed=3148344"},{"test":"test_gap_gc_string_copy_source_rooting","arm":"cons_scan_off","result":"PASS","cycles":1,"evacuated":0,"scavenged":7,"reclaimed":3148344,"evidence":"cycles=1 evacuated=0 scavenged=7 reclaimed=3148344"},{"test":"test_gap_gc_string_copy_source_rooting","arm":"shipped_default","result":"PASS","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"default","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"safepoint_minor","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"evac_minor","result":"UNVER","cycles":1,"evacuated":0,"scavenged":0,"reclaimed":29752,"evidence":"cycles=1 evacuated=0 scavenged=0 reclaimed=29752"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"verify_evac","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"force_verify","result":"PASS","cycles":1,"evacuated":0,"scavenged":4154,"reclaimed":89256,"evidence":"cycles=1 evacuated=0 scavenged=4154 reclaimed=89256"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"cons_scan_off","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_repeat_reentrant_count","arm":"shipped_default","result":"PASS","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_coalesce_local_root","arm":"default","result":"PASS","cycles":13,"evacuated":0,"scavenged":11792,"reclaimed":78358488,"evidence":"cycles=13 evacuated=0 scavenged=11792 reclaimed=78358488"},{"test":"test_gap_gc_coalesce_local_root","arm":"safepoint_minor","result":"PASS","cycles":13,"evacuated":0,"scavenged":11792,"reclaimed":78358488,"evidence":"cycles=13 evacuated=0 scavenged=11792 reclaimed=78358488"},{"test":"test_gap_gc_coalesce_local_root","arm":"evac_minor","result":"PASS","cycles":14,"evacuated":0,"scavenged":12223,"reclaimed":94898968,"evidence":"cycles=14 evacuated=0 scavenged=12223 reclaimed=94898968"},{"test":"test_gap_gc_coalesce_local_root","arm":"verify_evac","result":"PASS","cycles":13,"evacuated":0,"scavenged":34001,"reclaimed":89143280,"evidence":"cycles=13 evacuated=0 scavenged=34001 reclaimed=89143280"},{"test":"test_gap_gc_coalesce_local_root","arm":"force_verify","result":"PASS","cycles":14,"evacuated":0,"scavenged":26425,"reclaimed":97490336,"evidence":"cycles=14 evacuated=0 scavenged=26425 reclaimed=97490336"},{"test":"test_gap_gc_coalesce_local_root","arm":"cons_scan_off","result":"PASS","cycles":14,"evacuated":0,"scavenged":12223,"reclaimed":94898968,"evidence":"cycles=14 evacuated=0 scavenged=12223 reclaimed=94898968"},{"test":"test_gap_gc_coalesce_local_root","arm":"shipped_default","result":"PASS","cycles":1,"evacuated":0,"scavenged":8208,"reclaimed":36294288,"evidence":"cycles=1 evacuated=0 scavenged=8208 reclaimed=36294288"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"default","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"safepoint_minor","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"evac_minor","result":"UNVER","cycles":1,"evacuated":0,"scavenged":0,"reclaimed":85440,"evidence":"cycles=1 evacuated=0 scavenged=0 reclaimed=85440"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"verify_evac","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"force_verify","result":"PASS","cycles":1,"evacuated":0,"scavenged":4220,"reclaimed":256320,"evidence":"cycles=1 evacuated=0 scavenged=4220 reclaimed=256320"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"cons_scan_off","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_for_in_proxy_callback_roots","arm":"shipped_default","result":"PASS","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_suffix_cursor","arm":"default","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_suffix_cursor","arm":"safepoint_minor","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_suffix_cursor","arm":"evac_minor","result":"PASS","cycles":1,"evacuated":0,"scavenged":41,"reclaimed":116928,"evidence":"cycles=1 evacuated=0 scavenged=41 reclaimed=116928"},{"test":"test_gap_gc_string_suffix_cursor","arm":"verify_evac","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_suffix_cursor","arm":"force_verify","result":"PASS","cycles":1,"evacuated":0,"scavenged":41,"reclaimed":116928,"evidence":"cycles=1 evacuated=0 scavenged=41 reclaimed=116928"},{"test":"test_gap_gc_string_suffix_cursor","arm":"cons_scan_off","result":"UNVER","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_string_suffix_cursor","arm":"shipped_default","result":"PASS","cycles":0,"evacuated":0,"scavenged":0,"reclaimed":0,"evidence":"cycles=0 evacuated=0 scavenged=0 reclaimed=0"},{"test":"test_gap_gc_array_shift_queue","arm":"default","result":"UNVER","cycles":13,"evacuated":0,"scavenged":0,"reclaimed":6292440,"evidence":"cycles=13 evacuated=0 scavenged=0 reclaimed=6292440"},{"test":"test_gap_gc_array_shift_queue","arm":"safepoint_minor","result":"UNVER","cycles":13,"evacuated":0,"scavenged":0,"reclaimed":6292440,"evidence":"cycles=13 evacuated=0 scavenged=0 reclaimed=6292440"},{"test":"test_gap_gc_array_shift_queue","arm":"evac_minor","result":"UNVER","cycles":13,"evacuated":0,"scavenged":0,"reclaimed":6292440,"evidence":"cycles=13 evacuated=0 scavenged=0 reclaimed=6292440"},{"test":"test_gap_gc_array_shift_queue","arm":"verify_evac","result":"PASS","cycles":13,"evacuated":0,"scavenged":12456,"reclaimed":7871088,"evidence":"cycles=13 evacuated=0 scavenged=12456 reclaimed=7871088"},{"test":"test_gap_gc_array_shift_queue","arm":"force_verify","result":"PASS","cycles":25,"evacuated":0,"scavenged":44772,"reclaimed":2326064,"evidence":"cycles=25 evacuated=0 scavenged=44772 reclaimed=2326064"},{"test":"test_gap_gc_array_shift_queue","arm":"cons_scan_off","result":"UNVER","cycles":13,"evacuated":0,"scavenged":0,"reclaimed":6292440,"evidence":"cycles=13 evacuated=0 scavenged=0 reclaimed=6292440"},{"test":"test_gap_gc_array_shift_queue","arm":"shipped_default","result":"PASS","cycles":12,"evacuated":0,"scavenged":0,"reclaimed":13270688,"evidence":"cycles=12 evacuated=0 scavenged=0 reclaimed=13270688"}],"summary":{"pass":428,"unverified":167,"xfail":0,"fail":7}}
diff --git a/benchmarks/native_property_get/evidence/measurement-receipts.tar.gz b/benchmarks/native_property_get/evidence/measurement-receipts.tar.gz
new file mode 100644
index 0000000000..b2e1b15828
Binary files /dev/null and b/benchmarks/native_property_get/evidence/measurement-receipts.tar.gz differ
diff --git a/benchmarks/native_property_get/evidence/parity.stdout b/benchmarks/native_property_get/evidence/parity.stdout
new file mode 100644
index 0000000000..afc75a2cbf
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/parity.stdout
@@ -0,0 +1,42 @@
+inherited data true
+shadowed data true
+deleted shadow true
+own undefined true
+frozen prototype true
+frozen own data true
+own getter result true
+own getter once true
+distinct receiver true
+distinct getter once true
+inherited getter receiver true
+inherited getter once true
+data shadows getter true
+shadow suppresses getter true
+setter only true
+proxy result true
+proxy once true
+proxy prototype true
+prototype proxy once true
+revoked proxy throws true
+coerced key result true
+coercion then getter once true
+symbol key true
+private-looking string true
+long key true
+inherited class static true
+private field true
+class expression static true
+closure expando true
+array expando true
+array length true
+typed array index true
+date constructor true
+regexp expando true
+regexp lastIndex true
+regexp accessor true
+regexp getter once true
+inherited toJSON getter receiver true
+toJSON getter once true
+toJSON method once true
+noncallable toJSON true
+native property Get parity passed
diff --git a/benchmarks/native_property_get/evidence/runtime-source-sha256.json b/benchmarks/native_property_get/evidence/runtime-source-sha256.json
new file mode 100644
index 0000000000..b694018dc0
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/runtime-source-sha256.json
@@ -0,0 +1,9 @@
+{
+  "crates/perry-runtime/src/json/stringify.rs": "9ca55d9bb6ce1903a6fb53958601c6e42fc952ab093d5cbd598768212f4041bc",
+  "crates/perry-runtime/src/object/field_get_set/get_field_by_name.rs": "7fdde1279dcc2ab18ef17dd59b55d483a47e40d14d64cd94352cbf1ddc174067",
+  "crates/perry-runtime/src/object/mod.rs": "7c5950f1320cd07d3dfbceb4e27a81c3cfe994fce92b8e0eaa60e0a7c25d79c8",
+  "crates/perry-runtime/src/object/native_get.rs": "cf4e83f0e00ba10a51f759ccf487c1a5d3aec2d00dce836e80a00f7b11f19727",
+  "crates/perry-runtime/src/object/native_get/tests.rs": "d423834bdf4a2a054efc1003fca777bdf2f8fb89c4d93ec4fe3f809c81507e4d",
+  "crates/perry-runtime/src/proxy/reflect.rs": "32c75ac50727e3bab55c9433a603c7debce999732d1316f4288493457b2f6f45",
+  "crates/perry-runtime/src/value/dynamic_object.rs": "c27f4e02c6b498ce70299ba782a9dd31b8dc38ba4fa4dca3d2e18ee558c59f19"
+}
diff --git a/benchmarks/native_property_get/evidence/validation-logs.tar.gz b/benchmarks/native_property_get/evidence/validation-logs.tar.gz
new file mode 100644
index 0000000000..3550f98a82
Binary files /dev/null and b/benchmarks/native_property_get/evidence/validation-logs.tar.gz differ
diff --git a/benchmarks/native_property_get/evidence/validation.json b/benchmarks/native_property_get/evidence/validation.json
new file mode 100644
index 0000000000..0189269932
--- /dev/null
+++ b/benchmarks/native_property_get/evidence/validation.json
@@ -0,0 +1,31 @@
+{
+  "runtime_tests": {
+    "candidate": {
+      "passed": 3803,
+      "ignored": 4,
+      "failed": 0
+    },
+    "base": {
+      "passed": 3795,
+      "ignored": 4,
+      "failed": 0
+    }
+  },
+  "regex_off_check": "pass",
+  "fmt": "pass",
+  "clippy_new_diagnostics": 0,
+  "fault_mutations_killed": 3,
+  "node_parity_output_lines": 42,
+  "lint": {
+    "commands": 83,
+    "failed": 3,
+    "ci_only_skipped": 2,
+    "failures": [
+      "public benchmark freshness (reproduced on base)",
+      "workspace warnings (existing WebAssembly helpers and test cache assignment)",
+      "API docs drift (unchanged API manifest adds bun-pty)"
+    ]
+  },
+  "gc_ratchet": "same-host base comparison passes; 126 medians identical; old pinned baseline fails on both",
+  "gc_stress": "428 PASS, 167 UNVER, seven HTTP/2 failures reproduced exactly on base; all required arms live"
+}
diff --git a/benchmarks/native_property_get/faults.py b/benchmarks/native_property_get/faults.py
new file mode 100644
index 0000000000..8aaf6594c3
--- /dev/null
+++ b/benchmarks/native_property_get/faults.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""Run three source mutations serially, restoring each file even on failure.
+
+Run only while no other build or validation reads this worktree.
+"""
+import argparse
+import json
+from pathlib import Path
+import subprocess
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--out", required=True, type=Path)
+    args = parser.parse_args()
+    repo = Path(__file__).resolve().parents[2]
+    out = args.out.resolve()
+    out.mkdir(parents=True, exist_ok=False)
+    native_get = repo / "crates/perry-runtime/src/object/native_get.rs"
+    expando = repo / "crates/perry-runtime/src/object/exotic_expando.rs"
+    prefix = "object::native_get::tests::"
+    mutations = [
+        ("fast_path_removed", native_get,
+         "if !receiver.is_pointer() || key.first() == Some(&b'#')",
+         "if true || !receiver.is_pointer() || key.first() == Some(&b'#')",
+         prefix + "own_data_is_served_and_matches_forced_slow_for_all_value_kinds"),
+        ("accessor_guard_removed", native_get,
+         "if meta.is_null() || (*meta).accessor_key_bits & accessor_bit == 0 {",
+         "if true {",
+         prefix + "accessor_bloom_guard_preserves_own_and_inherited_getter_calls"),
+        ("exotic_expando_ignored", expando,
+         'if kind != ExoticKind::Error && !expando_in_use() && !super::descriptors_in_use() {',
+         'if kind == ExoticKind::RegExp && name == "value" { return None; }\n'
+         '    if kind != ExoticKind::Error && !expando_in_use() && !super::descriptors_in_use() {',
+         prefix + "regexp_expandos_and_accessors_remain_on_the_exotic_path"),
+    ]
+
+    def test(name, label, exact=False):
+        argv = ["cargo", "test", "-j4", "-p", "perry-runtime", "--lib", name,
+                "--", "--test-threads=1"]
+        if exact:
+            argv.append("--exact")
+        with (out / (label + ".log")).open("w") as log:
+            result = subprocess.run(argv, cwd=repo, stdout=log, stderr=subprocess.STDOUT)
+        return result.returncode, (out / (label + ".log")).read_text()
+
+    code, _ = test("object::native_get::tests", "healthy_before")
+    if code:
+        raise RuntimeError("healthy native Get tests failed before fault injection")
+    results = []
+    for name, path, old, new, test_name in mutations:
+        original = path.read_bytes()
+        text = original.decode()
+        if text.count(old) != 1:
+            raise ValueError(f"{name}: mutation anchor is not unique")
+        try:
+            path.write_text(text.replace(old, new))
+            code, log = test(test_name, name, exact=True)
+            killed = code != 0 and f"test {test_name} ... FAILED" in log and "test result: FAILED" in log
+            results.append({"mutation": name, "test": test_name,
+                            "exit_code": code, "assertion_failed": killed})
+            (out / "results.json").write_text(json.dumps(results, indent=2) + "\n")
+            if not killed:
+                raise RuntimeError(f"{name}: expected an assertion failure, see log")
+            print(name, "killed by", test_name, flush=True)
+        finally:
+            path.write_bytes(original)
+    code, _ = test("object::native_get::tests", "healthy_after")
+    if code:
+        raise RuntimeError("healthy native Get tests failed after restoring sources")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/benchmarks/native_property_get/iterator.ts b/benchmarks/native_property_get/iterator.ts
new file mode 100644
index 0000000000..e5099b3164
--- /dev/null
+++ b/benchmarks/native_property_get/iterator.ts
@@ -0,0 +1,17 @@
+// Reuse the result object to expose next/done/value reads without allocating
+// a result or retaining a large array on every iteration.
+const count = Number(process.argv[2] || "200000");
+let index = 0;
+const result = { done: false, value: 0 };
+const iterator: any = {
+  next() {
+    result.done = index >= count;
+    result.value = index++;
+    return result;
+  },
+};
+const iterable: any = { [Symbol.iterator]() { return iterator; } };
+let sum = 0;
+for (const value of iterable) sum += value;
+if (sum !== count * (count - 1) / 2) throw new Error("iterator mismatch");
+console.log(sum);
diff --git a/benchmarks/native_property_get/measure.py b/benchmarks/native_property_get/measure.py
new file mode 100644
index 0000000000..e9b33defe9
--- /dev/null
+++ b/benchmarks/native_property_get/measure.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+"""Compile checked probes, count Linux user instructions, and fold attribution."""
+import argparse
+import collections
+import hashlib
+import json
+import os
+from pathlib import Path
+import re
+import shutil
+import statistics
+import subprocess
+
+
+PROBES = {
+    "reflect_own": 200000,
+    "reflect_proto": 200000,
+    "iterator": 200000,
+    "thenable": 20000,
+    "tojson": 100000,
+}
+GET = re.compile(
+    r"js_reflect_get|js_object_get_field_by_name|js_dynamic_object_get_property"
+    r"|get_field_by_name_object_tail|native_get::"
+)
+
+
+def digest(path):
+    with path.open("rb") as stream:
+        return hashlib.file_digest(stream, "sha256").hexdigest()
+
+
+def run(argv, **kwargs):
+    return subprocess.run(argv, check=True, **kwargs)
+
+
+def fold(stream):
+    # Same root-to-leaf frame order as repro/tonly/fold.py. Preserve perf's
+    # sample periods as weights, including a shortened final sample period.
+    stacks = collections.Counter()
+    frames = []
+    period = 0
+    for line in stream:
+        if not line.strip():
+            if frames:
+                stacks[";".join(reversed(frames))] += period
+            frames = []
+            period = 0
+        elif not line[0].isspace():
+            match = re.search(r"\s(\d+)\s+instructions:u:", line)
+            if not match:
+                raise ValueError("unexpected perf sample header: " + line)
+            period = int(match[1])
+        else:
+            parts = line.strip().split(None, 1)
+            if len(parts) == 2:
+                symbol = parts[1].rsplit(" (", 1)[0]
+                frames.append(re.sub(r"\+0x[0-9a-f]+$", "", symbol))
+    if frames:
+        stacks[";".join(reversed(frames))] += period
+    if not stacks or not sum(stacks.values()):
+        raise ValueError("perf produced no instruction stacks")
+    return stacks
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--runtime-dir", required=True, type=Path)
+    parser.add_argument("--out", required=True, type=Path)
+    parser.add_argument("--node", default="node")
+    parser.add_argument("--smoke", action="store_true", help="compile/parity only")
+    args = parser.parse_args()
+    source = Path(__file__).resolve().parent
+    repo = source.parents[1]
+    runtime = args.runtime_dir.resolve()
+    perry = runtime / "perry"
+    out = args.out.resolve()
+    out.mkdir(parents=True, exist_ok=False)
+    env = dict(os.environ, PERRY_RUNTIME_DIR=str(runtime),
+               PERRY_CACHE_DIR=str(out / "cache"), PERRY_NO_TELEMETRY="1")
+    # LLVM-built runtime DWARF can exceed the host binutils reader's support.
+    # Keep this override local to the run, including perf record's postlude.
+    addr2line = shutil.which("llvm-addr2line-22")
+    if addr2line:
+        config = out / "perfconfig"
+        config.write_text(f"[annotate]\naddr2line = {addr2line}\n")
+        env["PERF_CONFIG"] = str(config)
+    node_version = run([args.node, "--version"], capture_output=True, text=True).stdout.strip()
+    if node_version.lstrip("v") != (repo / ".node-version").read_text().strip().lstrip("v"):
+        raise ValueError("Node version does not match .node-version: " + node_version)
+    patch = run(["git", "-C", str(repo), "diff", "--binary", "HEAD"], capture_output=True).stdout
+    (out / "source.patch").write_bytes(patch)
+    metadata = {
+        "commit": run(["git", "-C", str(repo), "rev-parse", "HEAD"],
+                      capture_output=True, text=True).stdout.strip(),
+        "node": node_version,
+        "source_patch_sha256": hashlib.sha256(patch).hexdigest(),
+        "artifacts": {name: digest(runtime / name) for name in
+                      ("perry", "libperry_runtime.a", "libperry_stdlib.a")},
+        "probes": {name: digest(source / (name + ".ts")) for name in PROBES},
+    }
+    (out / "metadata.json").write_text(json.dumps(metadata, indent=2) + "\n")
+    results = {}
+    for name, default_count in PROBES.items():
+        count = 100 if args.smoke else default_count
+        ts = source / (name + ".ts")
+        binary = out / name
+        with (out / (name + ".compile.log")).open("w") as log:
+            run([str(perry), "compile", str(ts), "--no-auto-optimize", "--debug-symbols",
+                 "-o", str(binary)],
+                env=env, stdout=log, stderr=subprocess.STDOUT)
+        expected = run([args.node, "--experimental-strip-types", str(ts), str(count)],
+                       capture_output=True).stdout
+        actual = run([str(binary), str(count)], env=env, capture_output=True).stdout
+        if not expected or actual != expected:
+            raise ValueError(f"{name}: Node {expected!r}, Perry {actual!r}")
+        (out / (name + ".stdout")).write_bytes(actual)
+        if args.smoke:
+            print(name, "parity passed", flush=True)
+            continue
+        counts = []
+        for repeat in range(3):
+            stat = out / f"{name}.{repeat}.stat"
+            run(["perf", "stat", "-x,", "-e", "instructions:u", "-o", str(stat),
+                 "--", str(binary), str(count)], env=env, stdout=subprocess.DEVNULL)
+            rows = [line.split(",") for line in stat.read_text().splitlines()]
+            counts.append(next(int(row[0]) for row in rows if len(row) > 2
+                               and row[2] == "instructions:u"))
+        data = out / (name + ".perf.data")
+        with (out / (name + ".record.log")).open("w") as log:
+            run(["perf", "record", "--no-buildid", "--no-buildid-cache", "-m", "64M",
+                 "-e", "instructions:u", "-c", "500003",
+                 "--call-graph", "dwarf,16384", "-o", str(data), "--", str(binary), str(count)],
+                env=env, stdout=subprocess.DEVNULL, stderr=log)
+        if "lost" in (out / (name + ".record.log")).read_text().lower():
+            raise ValueError(f"{name}: perf lost samples; attribution is incomplete")
+        with subprocess.Popen(["perf", "script", "--no-inline", "-i", str(data)],
+                              stdout=subprocess.PIPE, text=True, env=env) as process:
+            stacks = fold(process.stdout)
+            if process.wait() != 0:
+                raise RuntimeError("perf script failed")
+        with (out / (name + ".folded")).open("w") as stream:
+            for stack, weight in stacks.most_common():
+                stream.write(f"{weight} {stack}\n")
+        total = sum(stacks.values())
+        get_weight = sum(weight for stack, weight in stacks.items() if GET.search(stack))
+        if not get_weight:
+            raise ValueError(f"{name}: no Get frames; verify symbols and probe coverage")
+        leaves = collections.Counter()
+        for stack, weight in stacks.items():
+            if GET.search(stack):
+                leaves[stack.rsplit(";", 1)[-1]] += weight
+        results[name] = {
+            "iterations": count, "instructions": counts,
+            "median": statistics.median(counts),
+            "binary_sha256": digest(binary), "sampled_instructions": total,
+            "get_inclusive_percent": 100 * get_weight / total,
+            "get_leaf_percent_of_program": [(leaf, 100 * weight / total)
+                                            for leaf, weight in leaves.most_common(20)],
+        }
+        (out / "results.json").write_text(json.dumps(results, indent=2) + "\n")
+        print(name, results[name]["median"], results[name]["get_inclusive_percent"], flush=True)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/benchmarks/native_property_get/reflect_own.ts b/benchmarks/native_property_get/reflect_own.ts
new file mode 100644
index 0000000000..e3f788f2c3
--- /dev/null
+++ b/benchmarks/native_property_get/reflect_own.ts
@@ -0,0 +1,7 @@
+// Runtime Reflect.get entry, with an ordinary own data property.
+const count = Number(process.argv[2] || "200000");
+const object: any = { value: 7 };
+let sum = 0;
+for (let i = 0; i < count; i++) sum += Reflect.get(object, "value");
+if (sum !== count * 7) throw new Error("own data read mismatch");
+console.log(sum);
diff --git a/benchmarks/native_property_get/reflect_proto.ts b/benchmarks/native_property_get/reflect_proto.ts
new file mode 100644
index 0000000000..fd45556cfd
--- /dev/null
+++ b/benchmarks/native_property_get/reflect_proto.ts
@@ -0,0 +1,7 @@
+// Same read through two explicitly recorded ordinary prototype links.
+const count = Number(process.argv[2] || "200000");
+const object: any = Object.create(Object.create({ value: 7 }));
+let sum = 0;
+for (let i = 0; i < count; i++) sum += Reflect.get(object, "value");
+if (sum !== count * 7) throw new Error("prototype data read mismatch");
+console.log(sum);
diff --git a/benchmarks/native_property_get/thenable.ts b/benchmarks/native_property_get/thenable.ts
new file mode 100644
index 0000000000..6ad27063ee
--- /dev/null
+++ b/benchmarks/native_property_get/thenable.ts
@@ -0,0 +1,14 @@
+// A positive then lookup; the existing negative-then probe cannot serve it.
+const count = Number(process.argv[2] || "20000");
+const thenable: any = { then(resolve: any) { resolve(7); } };
+let sum = 0;
+let completed = 0;
+for (let i = 0; i < count; i++) {
+  Promise.resolve(thenable).then((value: number) => {
+    sum += value;
+    if (++completed === count) {
+      if (sum !== count * 7) throw new Error("thenable mismatch");
+      console.log(sum);
+    }
+  });
+}
diff --git a/benchmarks/native_property_get/tojson.ts b/benchmarks/native_property_get/tojson.ts
new file mode 100644
index 0000000000..532ffe260c
--- /dev/null
+++ b/benchmarks/native_property_get/tojson.ts
@@ -0,0 +1,11 @@
+// A positive inherited toJSON lookup on every stringify call.
+const count = Number(process.argv[2] || "100000");
+const object: any = Object.create({ toJSON() { return 7; } });
+let sum = 0;
+for (let i = 0; i < count; i++) {
+  const text = JSON.stringify(object);
+  if (text !== "7") throw new Error("toJSON mismatch");
+  sum += text.length;
+}
+if (sum !== count) throw new Error("stringify count mismatch");
+console.log(sum);
diff --git a/changelog.d/10248-native-property-get.md b/changelog.d/10248-native-property-get.md
new file mode 100644
index 0000000000..93a0099906
--- /dev/null
+++ b/changelog.d/10248-native-property-get.md
@@ -0,0 +1,10 @@
+Speed up native property Get for ordinary own and prototype data properties.
+The shared lookup borrows keys and checks shape and accessor metadata before
+returning, while getters, proxies, class statics, and exotics retain their
+existing dispatch. JSON.stringify reuses a canonical toJSON key.
+
+Linux user-instruction counts decreased 71–78% in Reflect.get probes, 12% in
+positive thenable assimilation, and 43% in inherited toJSON serialization; the
+user-iterator control was unchanged. Differential tests, Node parity, fault
+injections, and measurement/validation receipts are recorded in
+benchmarks/native_property_get/REPORT.md.
diff --git a/crates/perry-runtime/src/json/stringify.rs b/crates/perry-runtime/src/json/stringify.rs
index e68a0f40be..f768849c94 100644
--- a/crates/perry-runtime/src/json/stringify.rs
+++ b/crates/perry-runtime/src/json/stringify.rs
@@ -273,19 +273,17 @@ pub(crate) unsafe fn object_get_to_json(ptr: *const u8) -> Option<f64> {
     let scope = crate::gc::RuntimeHandleScope::new();
     let recv_handle = scope.root_nanbox_f64(recv);
 
-    let key = js_string_from_bytes(b"toJSON".as_ptr(), 6);
+    let key = crate::string::canonical_key(b"toJSON");
     let key_handle = scope.root_string_ptr(key);
 
-    let obj_ptr = recv_handle.get_nanbox_f64();
-    let obj_ptr = (obj_ptr.to_bits() & POINTER_MASK) as *const crate::ObjectHeader;
     let method = key_handle.with_const_ptr(|key: *const crate::string::StringHeader| {
-        crate::object::js_object_get_field_by_name(obj_ptr, key)
+        crate::object::native_get::get_by_canonical_key(recv_handle.get_nanbox_f64(), key)
     });
 
     // Only treat it as toJSON if it actually resolved to a callable closure
     // (POINTER_TAG + closure). A plain object with no `toJSON`, or a `toJSON`
     // data field that isn't a function, returns `None` → serialize normally.
-    let method_bits = method.bits();
+    let method_bits = method.to_bits();
     if (method_bits & 0xFFFF_0000_0000_0000) != POINTER_TAG {
         return None;
     }
diff --git a/crates/perry-runtime/src/object/field_get_set/get_field_by_name.rs b/crates/perry-runtime/src/object/field_get_set/get_field_by_name.rs
index 721af36d12..5032f7d384 100644
--- a/crates/perry-runtime/src/object/field_get_set/get_field_by_name.rs
+++ b/crates/perry-runtime/src/object/field_get_set/get_field_by_name.rs
@@ -27,6 +27,9 @@ pub extern "C" fn js_object_get_field_by_name(
     obj: *const ObjectHeader,
     key: *const crate::StringHeader,
 ) -> JSValue {
+    if let Some(value) = unsafe { super::super::native_get::try_data_get_by_name(obj, key) } {
+        return value;
+    }
     // Guard hoisted to the call site: an ordinary key is rejected on a length
     // compare and one byte here, so the overwhelmingly common property read
     // makes no call into the private-member path at all.
diff --git a/crates/perry-runtime/src/object/mod.rs b/crates/perry-runtime/src/object/mod.rs
index e15899d4e5..12c24ddc98 100644
--- a/crates/perry-runtime/src/object/mod.rs
+++ b/crates/perry-runtime/src/object/mod.rs
@@ -135,6 +135,7 @@ pub(crate) mod iterator_prototypes;
 pub(crate) mod map_set_subclass;
 mod namespace_create;
 mod native_call_method;
+pub(crate) mod native_get;
 mod native_module;
 mod nm_namespace_hooks;
 pub(crate) use native_module::class_instance_has_member;
diff --git a/crates/perry-runtime/src/object/native_get.rs b/crates/perry-runtime/src/object/native_get.rs
new file mode 100644
index 0000000000..c674092e5b
--- /dev/null
+++ b/crates/perry-runtime/src/object/native_get.rs
@@ -0,0 +1,171 @@
+//! Callback-free positive Get for ordinary data properties.
+//!
+//! Every pointer and key borrow below is confined to a lookup that cannot
+//! allocate in the JS heap, collect, or invoke user code. A miss is NOT an
+//! absent-property verdict: the caller must run the existing generic Get.
+
+use super::{shapes, ObjectHeader};
+use crate::value::JSValue;
+
+/// Read using an already materialized property key. String keys, including
+/// inline strings, require neither ToPropertyKey nor another key allocation.
+#[inline]
+pub(crate) unsafe fn try_data_get(receiver: JSValue, key: JSValue) -> Option<JSValue> {
+    if !receiver.is_pointer() || !key.is_any_string() {
+        return None;
+    }
+    let mut scratch = [0; crate::value::SHORT_STRING_MAX_LEN];
+    let bytes = crate::string::js_string_key_bytes(key, &mut scratch)?;
+    try_data_get_bytes(receiver, bytes)
+}
+
+/// Raw-pointer sibling for the named-field ABI, which accepts both raw and
+/// NaN-boxed object pointers. Reject other encodings before touching memory.
+#[inline]
+pub(crate) unsafe fn try_data_get_by_name(
+    object: *const ObjectHeader,
+    key: *const crate::StringHeader,
+) -> Option<JSValue> {
+    if key.is_null() || !crate::value::addr_class::is_plausible_heap_addr(key as usize) {
+        return None;
+    }
+    if (*key).byte_len > (*key).capacity || (*key).byte_len >= 1 << 28 {
+        return None;
+    }
+    let bits = object as u64;
+    let receiver = match bits >> 48 {
+        0 => JSValue::pointer(object as *mut u8),
+        0x7FFD => JSValue::from_bits(bits),
+        _ => return None,
+    };
+    let bytes =
+        std::slice::from_raw_parts(crate::string::string_data(key), (*key).byte_len as usize);
+    try_data_get_bytes(receiver, bytes)
+}
+
+/// Borrowed-name API for native callers. The keys lookup is consult-only:
+/// it never builds a shape index, materializes a key, or resolves a builtin.
+#[inline]
+pub(crate) unsafe fn try_data_get_bytes(receiver: JSValue, key: &[u8]) -> Option<JSValue> {
+    #[cfg(test)]
+    if FORCE_SLOW.with(|value| value.get()) {
+        return None;
+    }
+    if !receiver.is_pointer() || key.first() == Some(&b'#') || key == b"constructor" {
+        return None;
+    }
+    // Descriptor summaries use the same byte hash. Invalid UTF-8 stays on
+    // the WTF-8-aware slow path; no String is allocated for ordinary keys.
+    std::str::from_utf8(key).ok()?;
+    let accessor_bit = 1u64 << (super::key_bytes_hash(key.as_ptr(), key.len()) & 63);
+    let mut object = receiver.as_pointer::<ObjectHeader>();
+    let mut inherited = false;
+    for _ in 0..32 {
+        let addr = object as usize;
+        // Headerless Buffer/TypedArray/foreign handles must never be read as
+        // GcHeader-bearing objects. As in the existing own-field fast lane,
+        // require positive arena membership before inspecting the header.
+        if !crate::value::addr_class::is_plausible_heap_addr(addr)
+            || crate::arena::classify_heap_generation(addr) == crate::arena::HeapGeneration::Unknown
+        {
+            return None;
+        }
+        let header = crate::value::addr_class::try_read_gc_header(addr)?;
+        if header.obj_type != crate::gc::GC_TYPE_OBJECT
+            || header.gc_flags & crate::gc::GC_FLAG_FORWARDED != 0
+            || header._reserved & crate::gc::OBJ_FLAG_TYPED_ARRAY_PROTO != 0
+        {
+            return None;
+        }
+        let descriptor = shapes::object_shape_descriptor(object)?;
+        if descriptor.object_kind != shapes::ShapeObjectKind::Ordinary {
+            return None;
+        }
+        let class_id = (*object).class_id;
+        // Positive membership, rather than a blacklist of native class ids.
+        // Synthetic function/Object.create ids occupy the allocated prefix
+        // of this counter's range; reserved native ids are outside it.
+        let synthetic = class_id >= 0x8000_0000
+            && class_id < super::NEXT_SYNTHETIC_CLASS_ID.load(std::sync::atomic::Ordering::Relaxed);
+        if class_id != 0 && !synthetic && !super::is_anon_shape_class_id(class_id) {
+            return None;
+        }
+        if crate::process::is_process_env_ptr(addr)
+            || super::is_arguments_object(object)
+            || (key == b"toJSON" && crate::perf_hooks::is_perf_entry_object(object))
+        {
+            return None;
+        }
+        let meta = (*object).meta;
+        if !meta.is_null() && (*meta).elements != 0 {
+            return None;
+        }
+        // A data slot can remain underneath an accessor. A clear Bloom bit
+        // proves no accessor for THIS key; collisions conservatively decline.
+        // Same summary as descriptor_state::may_have_descriptor_entry; the
+        // receiver has already been classified, so do not classify it again.
+        if meta.is_null() || (*meta).accessor_key_bits & accessor_bit == 0 {
+            let keys = descriptor.keys as usize as *const crate::array::ArrayHeader;
+            if !keys.is_null() {
+                if let Some(slot) =
+                    super::keys_find_slot_by_bytes(keys, descriptor.logical_key_count, key)
+                {
+                    let value = super::field_get_set::object_field_at_with_live(
+                        object,
+                        slot,
+                        descriptor.live_inline_slot_count,
+                    );
+                    // Legacy inherited resolution treats undefined/null as
+                    // misses at some class edges. Preserve that fallback, and
+                    // the f64 entry's native-handle alias on undefined reads.
+                    if (inherited && (value.is_undefined() || value.is_null()))
+                        || (value.is_undefined() && super::native_this_alias::alias_active())
+                    {
+                        return None;
+                    }
+                    return Some(value);
+                }
+            }
+        } else {
+            return None;
+        }
+        if !meta.is_null() && (*meta).prototype != 0 {
+            let prototype = JSValue::from_bits((*meta).prototype);
+            if !prototype.is_pointer() {
+                return None;
+            }
+            object = prototype.as_pointer();
+        } else if synthetic {
+            // These are already-rooted per-class pointers, with no builtin
+            // name lookup or lazy construction. Declared prototype metadata
+            // has separate precedence and stays on the generic path.
+            if !super::class_decl_prototype_object(class_id).is_null() {
+                return None;
+            }
+            object = super::class_prototype_object(class_id);
+        } else {
+            // Default builtin prototypes may need initialization and can be
+            // replaced through globalThis. Do not resolve them under a borrow.
+            return None;
+        }
+        inherited = true;
+    }
+    None
+}
+
+/// Spec Get for a canonical (pre-interned) string key and the same receiver.
+/// The caller must keep both inputs live until entry. A fast hit is a leaf;
+/// the existing Reflect implementation owns all handles on a slow read.
+#[inline]
+pub(crate) unsafe fn get_by_canonical_key(receiver: f64, key: *const crate::StringHeader) -> f64 {
+    let property_key = JSValue::from_bits(crate::value::nanbox_string_key(key).to_bits());
+    crate::proxy::js_reflect_get(receiver, f64::from_bits(property_key.bits()), receiver)
+}
+
+#[cfg(test)]
+thread_local! {
+    static FORCE_SLOW: std::cell::Cell<bool> = const { std::cell::Cell::new(false) };
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/crates/perry-runtime/src/object/native_get/tests.rs b/crates/perry-runtime/src/object/native_get/tests.rs
new file mode 100644
index 0000000000..ddbbbc1bce
--- /dev/null
+++ b/crates/perry-runtime/src/object/native_get/tests.rs
@@ -0,0 +1,272 @@
+use super::*;
+use crate::object::{
+    js_object_alloc, js_object_create, js_object_delete_field, js_object_freeze,
+    js_object_set_field_by_name,
+};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+fn key(name: &str) -> *mut crate::StringHeader {
+    crate::string::canonical_key(name.as_bytes())
+}
+
+fn boxed(object: *const ObjectHeader) -> f64 {
+    crate::value::js_nanbox_pointer(object as i64)
+}
+
+fn object(name: &str, value: f64) -> *mut ObjectHeader {
+    let object = js_object_alloc(0, 0);
+    js_object_set_field_by_name(object, key(name), value);
+    object
+}
+
+struct Slow(bool);
+impl Slow {
+    fn enter() -> Self {
+        Self(FORCE_SLOW.with(|value| value.replace(true)))
+    }
+}
+impl Drop for Slow {
+    fn drop(&mut self) {
+        FORCE_SLOW.with(|value| value.set(self.0));
+    }
+}
+
+fn get(object: f64, name: &str) -> f64 {
+    unsafe { get_by_canonical_key(object, key(name)) }
+}
+
+fn differential(object: f64, name: &str, expected: f64) {
+    assert_eq!(get(object, name).to_bits(), expected.to_bits());
+    let _slow = Slow::enter();
+    assert_eq!(get(object, name).to_bits(), expected.to_bits());
+}
+
+#[test]
+fn own_data_is_served_and_matches_forced_slow_for_all_value_kinds() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    let child = object("child", 1.0);
+    let values = [
+        7.0,
+        -0.0,
+        f64::from_bits(crate::value::TAG_UNDEFINED),
+        f64::from_bits(crate::value::TAG_NULL),
+        f64::from_bits(crate::value::TAG_TRUE),
+        crate::value::js_nanbox_string(key("a heap string value") as i64),
+        boxed(child),
+    ];
+    for value in values {
+        let object = object("value", value);
+        let fast = unsafe { try_data_get_by_name(object, key("value")) };
+        assert_eq!(fast.map(|value| value.bits()), Some(value.to_bits()));
+        differential(boxed(object), "value", value);
+    }
+}
+
+#[test]
+fn prototype_data_mutation_shadow_delete_and_freeze_match_forced_slow() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    let prototype = object("value", 7.0);
+    let middle = js_object_create(boxed(prototype));
+    let child = js_object_create(middle);
+    let child_ptr = crate::value::js_nanbox_get_pointer(child) as *mut ObjectHeader;
+    assert_eq!(
+        unsafe { try_data_get_by_name(child_ptr, key("value")) }
+            .unwrap()
+            .bits(),
+        7.0f64.to_bits()
+    );
+    differential(child, "value", 7.0);
+    js_object_set_field_by_name(prototype, key("value"), 11.0);
+    differential(child, "value", 11.0);
+    js_object_set_field_by_name(child_ptr, key("value"), 13.0);
+    differential(child, "value", 13.0);
+    assert_eq!(js_object_delete_field(child_ptr, key("value")), 1);
+    differential(child, "value", 11.0);
+    js_object_freeze(boxed(prototype));
+    assert!(unsafe { try_data_get_by_name(child_ptr, key("value")) }.is_some());
+    differential(child, "value", 11.0);
+    let replacement = object("value", 17.0);
+    crate::object::prototype_chain::object_set_user_prototype(
+        child_ptr as usize,
+        boxed(replacement).to_bits(),
+    );
+    differential(child, "value", 17.0);
+}
+
+static GETTER_CALLS: AtomicUsize = AtomicUsize::new(0);
+
+extern "C" fn getter(_closure: *const crate::closure::ClosureHeader) -> f64 {
+    GETTER_CALLS.fetch_add(1, Ordering::Relaxed);
+    47.0
+}
+
+fn install_getter(object: *mut ObjectHeader, name: &str, has_getter: bool) {
+    let closure = crate::closure::js_closure_alloc(getter as *const u8, 0);
+    crate::object::descriptor_state::set_accessor_descriptor(
+        object as usize,
+        name.to_string(),
+        crate::object::descriptor_state::AccessorDescriptor {
+            get: if has_getter {
+                crate::value::js_nanbox_pointer(closure as i64).to_bits()
+            } else {
+                0
+            },
+            set: 0,
+        },
+    );
+}
+
+#[test]
+fn accessor_bloom_guard_preserves_own_and_inherited_getter_calls() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    GETTER_CALLS.store(0, Ordering::Relaxed);
+    let prototype = object("value", 1.0);
+    install_getter(prototype, "value", true);
+    let child = js_object_create(boxed(prototype));
+    for receiver in [boxed(prototype), child] {
+        assert!(
+            unsafe { try_data_get_bytes(JSValue::from_bits(receiver.to_bits()), b"value") }
+                .is_none()
+        );
+        differential(receiver, "value", 47.0);
+    }
+    assert_eq!(
+        GETTER_CALLS.load(Ordering::Relaxed),
+        4,
+        "one getter invocation per Get"
+    );
+    let child_ptr = crate::value::js_nanbox_get_pointer(child) as *mut ObjectHeader;
+    js_object_set_field_by_name(child_ptr, key("own"), 53.0);
+    differential(child, "own", 53.0);
+    assert_eq!(GETTER_CALLS.load(Ordering::Relaxed), 4);
+    install_getter(prototype, "value", false);
+    differential(
+        boxed(prototype),
+        "value",
+        f64::from_bits(crate::value::TAG_UNDEFINED),
+    );
+}
+
+#[test]
+fn unsupported_receivers_and_private_names_decline_and_preserve_results() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    let target = object("value", 59.0);
+    let handler = js_object_alloc(0, 0);
+    let proxy = crate::proxy::js_proxy_new(boxed(target), boxed(handler));
+    let array = crate::array::js_array_alloc(4);
+    let array_value = crate::value::js_nanbox_pointer(array as i64);
+    js_object_set_field_by_name(array as *mut ObjectHeader, key("value"), 59.0);
+    let closure = crate::closure::js_closure_alloc(getter as *const u8, 0);
+    js_object_set_field_by_name(closure as *mut ObjectHeader, key("value"), 59.0);
+    for receiver in [
+        proxy,
+        array_value,
+        crate::value::js_nanbox_pointer(closure as i64),
+    ] {
+        assert!(
+            unsafe { try_data_get_bytes(JSValue::from_bits(receiver.to_bits()), b"value") }
+                .is_none()
+        );
+        differential(receiver, "value", 59.0);
+    }
+    let private = object("#value", 61.0);
+    assert!(unsafe { try_data_get_by_name(private, key("#value")) }.is_none());
+    differential(boxed(private), "#value", 61.0);
+    assert!(unsafe { try_data_get_bytes(JSValue::number(3.5), b"value") }.is_none());
+}
+
+#[cfg(feature = "regex-engine")]
+#[test]
+fn regexp_expandos_and_accessors_remain_on_the_exotic_path() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    let regexp = crate::regex::js_regexp_new(key("x"), key("g"));
+    let regexp_obj = regexp as *mut ObjectHeader;
+    js_object_set_field_by_name(regexp_obj, key("value"), 67.0);
+    assert!(unsafe { try_data_get_by_name(regexp_obj, key("value")) }.is_none());
+    differential(boxed(regexp_obj), "value", 67.0);
+    GETTER_CALLS.store(0, Ordering::Relaxed);
+    install_getter(regexp_obj, "value", true);
+    differential(boxed(regexp_obj), "value", 47.0);
+    assert_eq!(GETTER_CALLS.load(Ordering::Relaxed), 2);
+}
+
+#[test]
+fn borrowed_long_and_inline_keys_match_without_materializing_for_the_fast_read() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    for name in [
+        "x",
+        "a property name longer than the inline copy buffer; keep borrowing through this lookup",
+    ] {
+        let object = object(name, 71.0);
+        assert_eq!(
+            unsafe {
+                try_data_get_bytes(JSValue::from_bits(boxed(object).to_bits()), name.as_bytes())
+            }
+            .unwrap()
+            .bits(),
+            71.0f64.to_bits()
+        );
+        differential(boxed(object), name, 71.0);
+    }
+}
+
+#[test]
+fn wide_spilled_and_deleted_keys_match_forced_slow() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    let object = js_object_alloc(0, 0);
+    for i in 0..100 {
+        js_object_set_field_by_name(object, key(&format!("field{i}")), i as f64);
+    }
+    for i in [0, 4, 50, 99] {
+        let name = format!("field{i}");
+        assert!(unsafe { try_data_get_by_name(object, key(&name)) }.is_some());
+        differential(boxed(object), &name, i as f64);
+        assert_eq!(js_object_delete_field(object, key(&name)), 1);
+        assert!(unsafe { try_data_get_by_name(object, key(&name)) }.is_none());
+        differential(
+            boxed(object),
+            &name,
+            f64::from_bits(crate::value::TAG_UNDEFINED),
+        );
+        js_object_set_field_by_name(object, key(&name), 101.0);
+        differential(boxed(object), &name, 101.0);
+    }
+}
+
+#[test]
+fn class_statics_buffers_and_mapped_arguments_use_the_slow_path() {
+    let _no_gc = crate::gc::GcSuppressScope::new();
+    unsafe {
+        let class_id = 0x0065_5234;
+        crate::object::js_register_class_id(class_id);
+        crate::object::js_class_register_static_field(
+            class_id,
+            b"value".as_ptr(),
+            5,
+            73.0,
+            std::ptr::null_mut(),
+        );
+        let class_value = f64::from_bits(crate::value::INT32_TAG | u64::from(class_id));
+        assert!(try_data_get_bytes(JSValue::from_bits(class_value.to_bits()), b"value").is_none());
+        differential(class_value, "value", 73.0);
+
+        let buffer = crate::buffer::js_buffer_alloc(8, 11);
+        let buffer_value = crate::value::js_nanbox_pointer(buffer as i64);
+        assert!(
+            try_data_get_bytes(JSValue::from_bits(buffer_value.to_bits()), b"length").is_none()
+        );
+        differential(buffer_value, "length", 8.0);
+
+        let args = crate::array::js_array_alloc(1);
+        crate::array::js_array_push(args, JSValue::number(1.0));
+        let arguments = crate::object::js_arguments_object_alloc(
+            crate::value::js_nanbox_pointer(args as i64),
+            f64::from_bits(crate::value::TAG_UNDEFINED),
+            0,
+        );
+        let cell = crate::r#box::js_box_alloc(79.0);
+        crate::object::js_arguments_object_map_index(arguments, 0, cell);
+        assert!(try_data_get_by_name(arguments, key("0")).is_none());
+        differential(boxed(arguments), "0", 79.0);
+    }
+}
diff --git a/crates/perry-runtime/src/proxy/reflect.rs b/crates/perry-runtime/src/proxy/reflect.rs
index f90ce9b89d..646e934456 100644
--- a/crates/perry-runtime/src/proxy/reflect.rs
+++ b/crates/perry-runtime/src/proxy/reflect.rs
@@ -17,6 +17,17 @@ use super::{
 /// as "use target".
 #[no_mangle]
 pub extern "C" fn js_reflect_get(target: f64, key: f64, receiver: f64) -> f64 {
+    // A data read has no observable receiver binding or key conversion. The
+    // classifier accepts only already-string keys and proves every traversed
+    // object ordinary before returning, so no handles are needed on a hit.
+    if let Some(value) = unsafe {
+        crate::object::native_get::try_data_get(
+            crate::value::JSValue::from_bits(target.to_bits()),
+            crate::value::JSValue::from_bits(key.to_bits()),
+        )
+    } {
+        return f64::from_bits(value.bits());
+    }
     if !reflect_value_is_object(target) {
         return reflect_non_object_typeerror("get");
     }
diff --git a/crates/perry-runtime/src/value/dynamic_object.rs b/crates/perry-runtime/src/value/dynamic_object.rs
index 9b3b916ec0..ece7502fcb 100644
--- a/crates/perry-runtime/src/value/dynamic_object.rs
+++ b/crates/perry-runtime/src/value/dynamic_object.rs
@@ -311,6 +311,15 @@ pub unsafe extern "C" fn js_dynamic_object_get_property(
     property_name_ptr: *const i8,
     property_name_len: usize,
 ) -> f64 {
+    if !property_name_ptr.is_null() && property_name_len != 0 {
+        let name = std::slice::from_raw_parts(property_name_ptr as *const u8, property_name_len);
+        if let Some(value) = crate::object::native_get::try_data_get_bytes(
+            JSValue::from_bits(obj_value.to_bits()),
+            name,
+        ) {
+            return f64::from_bits(value.bits());
+        }
+    }
     // A revocable Proxy value reaching this generic dynamic getter must go
     // through the Proxy's `get` trap. Proxy ids live at the TOP of the handle
     // band ([PROXY_ID_BAND_START, HANDLE_BAND_MAX)), so without this branch the
diff --git a/scripts/gc_runtime_root_holders.json b/scripts/gc_runtime_root_holders.json
index 533ae24984..ea85da096b 100644
--- a/scripts/gc_runtime_root_holders.json
+++ b/scripts/gc_runtime_root_holders.json
@@ -740,6 +740,12 @@
       "verdict": "not_a_gc_pointer",
       "why": "#9754 remembered set: `YoungLog<u32>` = two `Vec<u32>` (live + recycled spare) holding transition-cache SLOT INDICES whose `key_ptr`/`next_keys` a minor may act on. Indices, not addresses — a `u32` cannot hold a 48-bit pointer. The pointer-bearing entries they index are visited by `scan_transition_cache_roots_mut`, which is registered."
     },
+    {
+      "file": "crates/perry-runtime/src/object/native_get.rs",
+      "name": "FORCE_SLOW",
+      "verdict": "test_only",
+      "why": "#[cfg(test)] Cell<bool> selects the unchanged slow Get for differential tests. Holds only a boolean, never a GC address or JSValue, and is absent from shipped binaries."
+    },
     {
       "file": "crates/perry-runtime/src/object/native_module.rs",
       "name": "TEST_BOUND_METHOD_MOVE",
diff --git a/test-files/test_gap_native_property_get.ts b/test-files/test_gap_native_property_get.ts
new file mode 100644
index 0000000000..ef60b450bf
--- /dev/null
+++ b/test-files/test_gap_native_property_get.ts
@@ -0,0 +1,110 @@
+// Spec Get observability across ordinary data reads and fallback receivers.
+function check(actual: any, expected: any, label: string) {
+  if (!Object.is(actual, expected)) throw new Error(label);
+  console.log(label, true);
+}
+
+const proto: any = { value: 7, absent: 9 };
+const object: any = Object.create(proto);
+check(Reflect.get(object, "value"), 7, "inherited data");
+object.value = 11;
+check(Reflect.get(object, "value"), 11, "shadowed data");
+delete object.value;
+check(Reflect.get(object, "value"), 7, "deleted shadow");
+object.absent = undefined;
+check(Reflect.get(object, "absent"), undefined, "own undefined");
+Object.freeze(proto);
+check(Reflect.get(object, "value"), 7, "frozen prototype");
+Object.freeze(object);
+check(Reflect.get(object, "absent"), undefined, "frozen own data");
+
+let calls = 0;
+const owner: any = { value: 1, marker: 13 };
+Object.defineProperty(owner, "value", {
+  configurable: true,
+  get() { calls++; return this.marker; },
+});
+check(Reflect.get(owner, "value"), 13, "own getter result");
+check(calls, 1, "own getter once");
+check(Reflect.get(owner, "value", { marker: 17 }), 17, "distinct receiver");
+check(calls, 2, "distinct getter once");
+const child: any = Object.create(owner);
+child.marker = 19;
+check(Reflect.get(child, "value"), 19, "inherited getter receiver");
+check(calls, 3, "inherited getter once");
+Object.defineProperty(child, "value", { value: 23 });
+check(Reflect.get(child, "value"), 23, "data shadows getter");
+check(calls, 3, "shadow suppresses getter");
+Object.defineProperty(owner, "setterOnly", { set(value) {} });
+check(Reflect.get(owner, "setterOnly"), undefined, "setter only");
+
+let traps = 0;
+const proxy: any = new Proxy({ value: 29 }, {
+  get(target, key, receiver) {
+    traps++;
+    return Reflect.get(target, key, receiver);
+  },
+});
+check(Reflect.get(proxy, "value"), 29, "proxy result");
+check(traps, 1, "proxy once");
+check(Reflect.get(Object.create(proxy), "value"), 29, "proxy prototype");
+check(traps, 2, "prototype proxy once");
+const revoked = Proxy.revocable({}, {});
+revoked.revoke();
+let threw = false;
+try { Reflect.get(revoked.proxy, "value"); } catch { threw = true; }
+check(threw, true, "revoked proxy throws");
+
+let order = "";
+const key: any = { [Symbol.toPrimitive]() { order += "key;"; return "value"; } };
+const observed: any = { get value() { order += "get;"; return 31; } };
+check(Reflect.get(observed, key), 31, "coerced key result");
+check(order, "key;get;", "coercion then getter once");
+const symbol = Symbol("value");
+check(Reflect.get({ [symbol]: 37 }, symbol), 37, "symbol key");
+check(Reflect.get({ "#value": 41 }, "#value"), 41, "private-looking string");
+const longKey = "a property name longer than the inline owned string copy capacity, for borrowed key coverage";
+check(Reflect.get({ [longKey]: 43 }, longKey), 43, "long key");
+
+class Base {
+  static value = 47;
+  #value = 53;
+  read() { return this.#value; }
+}
+class Derived extends Base {}
+check(Reflect.get(Derived, "value"), 47, "inherited class static");
+check(new Derived().read(), 53, "private field");
+const expression: any = class { static value = 59; };
+check(Reflect.get(expression, "value"), 59, "class expression static");
+const fn: any = () => 0;
+fn.value = 61;
+check(Reflect.get(fn, "value"), 61, "closure expando");
+const array: any = [1, 2];
+array.value = 67;
+check(Reflect.get(array, "value"), 67, "array expando");
+check(Reflect.get(array, "length"), 2, "array length");
+check(Reflect.get(new Uint8Array([71]), "0"), 71, "typed array index");
+check(Reflect.get(new Date(0), "constructor"), Date, "date constructor");
+const re: any = /x/g;
+re.lastIndex = 3;
+re.value = 73;
+check(Reflect.get(re, "value"), 73, "regexp expando");
+check(Reflect.get(re, "lastIndex"), 3, "regexp lastIndex");
+Object.defineProperty(re, "value", { get() { calls++; return 79; } });
+check(Reflect.get(re, "value"), 79, "regexp accessor");
+check(calls, 4, "regexp getter once");
+let jsonGets = 0;
+let jsonCalls = 0;
+const jsonPrototype = {
+  get toJSON() {
+    jsonGets++;
+    return function () { jsonCalls++; return this.answer; };
+  }
+};
+const jsonChild: any = Object.create(jsonPrototype);
+jsonChild.answer = 83;
+check(JSON.stringify(jsonChild), "83", "inherited toJSON getter receiver");
+check(jsonGets, 1, "toJSON getter once");
+check(jsonCalls, 1, "toJSON method once");
+check(JSON.stringify({ toJSON: 0, value: 89 }), '{"toJSON":0,"value":89}', "noncallable toJSON");
+console.log("native property Get parity passed");