diff --git a/.github/workflows/release-packages.yml b/.github/workflows/release-packages.yml
index b343c46ce3..8d67dff2a7 100644
--- a/.github/workflows/release-packages.yml
+++ b/.github/workflows/release-packages.yml
@@ -1685,8 +1685,15 @@ jobs:
         # died on the first package with "You cannot publish over the
         # previously published versions" — the remaining six packages could
         # never go out (run 27239815088).
+        # One platform's failure must not starve the packages after it in
+        # glob order (with `set -e` a single E413/transient registry error
+        # aborted the loop mid-way — exactly how linux/windows sat at a stale
+        # version for weeks while darwin kept updating). Record failures,
+        # keep publishing, fail the step at the end with the full list; the
+        # already-published skip above keeps re-runs idempotent.
         run: |
           set -e
+          failed=""
           for pkg in ./npm/perry-*; do
             name=$(node -p "require('$pkg/package.json').name")
             ver=$(node -p "require('$pkg/package.json').version")
@@ -1695,8 +1702,15 @@ jobs:
               continue
             fi
             echo "=== publishing $pkg ==="
-            npm publish "$pkg" --access public --provenance
+            if ! npm publish "$pkg" --access public --provenance; then
+              echo "::error::npm publish failed for $name@$ver — continuing with remaining packages"
+              failed="$failed $name@$ver"
+            fi
           done
+          if [ -n "$failed" ]; then
+            echo "::error::failed platform packages:$failed"
+            exit 1
+          fi
 
       - name: Publish wrapper (@perryts/perry) last
         run: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a63b6b8e4d..3ee7b66fcb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## v0.5.1223 — audit-found capability-doc drift corrected; npm publish loop survives per-package failures (#5935)
+
+Docs: lookbehind regex WORKS (regex→fancy-regex hybrid) — removed from CLAUDE.md categorical gaps and rewritten in porting.md (section/table/scan-list); CLAUDE.md GC facts refreshed (~55 registered scanners, conservative scan production-off, module vars uniformly NaN-boxed + rooted — module_var_data_ids is long gone); limitations.md prototype section rewritten around reality (prototype-method assignment + setPrototypeOf supported; the two real gaps: `obj.__proto__ = x` assignment form, literal `{__proto__: []}` not visible to instanceof); gap-suite count 235→258. CI: release-packages.yml platform-publish loop no longer aborts on the first failure under set -e (the mechanism that left npm linux/windows stale while darwin updated) — failures are recorded, the loop continues, the step fails at the end with the full list.
+
 ## v0.5.1222 — await/yield in loop condition/update runs per iteration (#5934, fixes #5933)
 
 The async hoist's single pre-loop hoist (its own comment: "safe-but-incomplete approximation") evaluated a loop condition's await ONCE — async drain loops (`while ((v = await q.next()) !== undefined)`) never re-awaited (truthy first value spun forever on stale state, falsy never entered), `do…while` evaluated the condition before the first body run, and generators had the sibling defect at the linearize layer (`while (yield …)` cloned the condition into the cond state where residual yields lower to `0.0`). Restructured instead of hoisting out, preserving break/continue: `while (C)` → `while(true){ let t = C; if (!t) break; body }` (continue re-enters at the condition eval, per spec); `do B while (C)` → first-iteration flag + `while (first || C)` (body precedes first cond eval; continue falls through to the eval); `for (init; C; U)` keeps the For — awaited C moves to a body-top check with the condition slot emptied, awaited U moves to body end with every loop-level continue prefixed by it (new shared `prefix_loop_continues`). Linearize gains the three guarded yield-twin arms for direct generators. Review hardening: the update move bails to the previous lowering when a `continue` sits inside `try{}finally{}` (abrupt completion — the finally must run before the update and may override it), including the linearize arm guard so a fully-bailed For can't re-match its own desugar. e2e: `issue_5933_loop_condition_await.rs` (8 scenarios byte-for-byte vs node).
diff --git a/CLAUDE.md b/CLAUDE.md
index be46e6d3db..e215b42ea6 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -8,12 +8,12 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 Perry is a native TypeScript compiler written in Rust that compiles TypeScript source code directly to native executables. It uses SWC for TypeScript parsing and LLVM for code generation.
 
-**Current Version:** 0.5.1222
+**Current Version:** 0.5.1223
 
 
 ## TypeScript Parity Status
 
-Tracked via the gap test suite (`test-files/test_gap_*.ts`, 235 tests). Compared byte-for-byte against `node --experimental-strip-types`. Run via `./scripts/run_gap_tests.sh` (a thin wrapper over `run_parity_tests.sh --filter test_gap_` that builds the compiler itself and gates on no new untriaged failures).
+Tracked via the gap test suite (`test-files/test_gap_*.ts`, 258 tests). Compared byte-for-byte against `node --experimental-strip-types`. Run via `./scripts/run_gap_tests.sh` (a thin wrapper over `run_parity_tests.sh --filter test_gap_` that builds the compiler itself and gates on no new untriaged failures).
 
 **Last full sweep:** run `./run_parity_tests.sh` for the current snapshot. The umbrella tracker is #793 (Node.js + TypeScript compatibility roadmap); the previously-cited #447–#452 batch closed on 2026-05-04. Currently-open trackers worth knowing about:
 
@@ -23,7 +23,7 @@ Tracked via the gap test suite (`test-files/test_gap_*.ts`, 235 tests). Compared
 - **Test/CI mechanics** — `#794` (per-category parity thresholds), `#796` (gap-suite output truncation + O(n²) `normalize_output`), `#812` (42-module behavioral matrix), `#806/#807/#808` (test harnesses for mixins / async context / ≥300-init scale).
 - **Skip-list audit** — `#797` covers `test-parity/known_failures.json` provenance (issue # + date per entry).
 
-**Known categorical gaps**: lookbehind regex (Rust `regex` crate), `console.dir`/`console.group*` formatting, lone surrogate handling (WTF-8).
+**Known categorical gaps**: `console.dir`/`console.group*` formatting, lone surrogate handling (WTF-8). (Lookbehind regex is NOT a gap anymore: `perry-runtime/src/regex.rs` falls back from the `regex` crate to `fancy-regex` for lookbehind/backreferences, with capture-group translation and replacement expansion.)
 
 ## Workflow Requirements
 
@@ -101,11 +101,11 @@ TAG_TRUE      = 0x7FFC_0000_0000_0004    STRING_TAG  = 0x7FFF (lower 48 = ptr)
 
 Key functions: `js_nanbox_string/pointer/bigint`, `js_nanbox_get_pointer`, `js_get_string_pointer_unified`, `js_jsvalue_to_string`, `js_is_truthy`
 
-**Module-level variables**: Strings stored as F64 (NaN-boxed), Arrays/Objects as I64 (raw pointers). Access via `module_var_data_ids`.
+**Module-level variables**: uniform NaN-boxed doubles in `@perry_global_<mod>__<id>` LLVM globals, all registered as GC roots before module init (marked AND rewritten on evacuation). The old F64-strings/raw-I64-arrays split and `module_var_data_ids` no longer exist (a stale comment survives in `perry-transform/src/inline/mod.rs`).
 
 ## Garbage Collection
 
-Generational mark-sweep GC in `crates/perry-runtime/src/gc.rs` (default since v0.5.237 / Phase D). Two regions in the per-thread arena: nursery (`ARENA`, fills with new allocations, swept on minor GC) and old-gen (`OLD_ARENA`, holds tenured/evacuated objects). Conservative stack scan + precise shadow-stack roots + 9 registered scanners. Write barriers populate a remembered set so minor GC can avoid retracing the old-gen. Two-bit aging (`HAS_SURVIVED` / `TENURED`) promotes nursery survivors after 2 minor cycles; the C4b evacuation policy moves non-pinned tenured objects into old-gen with full reference rewriting only when generated write barriers are active and nursery/RSS pressure plus measured movable candidates justify the work. Idle nursery blocks observed empty for 2 GC cycles are `dealloc`'d back to the OS (C4b-δ, v0.5.235), and the next-trigger calc is hard-capped at the initial threshold (64 MB) so >90%-freed step-doubling can't blow up peak occupancy (C4b-δ-tune, v0.5.236). Triggers on arena block allocation (1 MB blocks since v0.5.196), malloc count threshold, or explicit `gc()` call. 8-byte GcHeader per allocation.
+Generational mark-sweep GC in `crates/perry-runtime/src/gc.rs` (default since v0.5.237 / Phase D). Two regions in the per-thread arena: nursery (`ARENA`, fills with new allocations, swept on minor GC) and old-gen (`OLD_ARENA`, holds tenured/evacuated objects). Precise shadow-stack roots + ~55 registered side-table scanners (`gc/mod.rs:298+`); a conservative stack scan exists but production mode resolves to SkipDisabled, so liveness rests on codegen shadow-stack spilling plus `RuntimeHandleScope` in runtime helpers. Write barriers populate a remembered set so minor GC can avoid retracing the old-gen. Two-bit aging (`HAS_SURVIVED` / `TENURED`) promotes nursery survivors after 2 minor cycles; the C4b evacuation policy moves non-pinned tenured objects into old-gen with full reference rewriting only when generated write barriers are active and nursery/RSS pressure plus measured movable candidates justify the work. Idle nursery blocks observed empty for 2 GC cycles are `dealloc`'d back to the OS (C4b-δ, v0.5.235), and the next-trigger calc is hard-capped at the initial threshold (64 MB) so >90%-freed step-doubling can't blow up peak occupancy (C4b-δ-tune, v0.5.236). Triggers on arena block allocation (1 MB blocks since v0.5.196), malloc count threshold, or explicit `gc()` call. 8-byte GcHeader per allocation.
 
 **Escape hatches**: `PERRY_GEN_GC=0`/`off`/`false` reverts to full mark-sweep (bisection only). `PERRY_GEN_GC_EVACUATE=0`/`off`/`false` disables policy evacuation; `=1`/`on`/`true` is accepted as auto-policy allowed, not unconditional evacuation. `PERRY_GC_FORCE_EVACUATE=1` stress-copies every marked non-pinned nursery object only when generated write barriers are active and policy evacuation is allowed. `PERRY_GC_VERIFY_EVACUATION=1` panics if any mutable live slot still points at a forwarded nursery object after an evacuation/rewrite cycle. `PERRY_WRITE_BARRIERS=0`/`off`/`false` disables codegen-emitted write barriers at compile time and runtime exact helper barriers at runtime for benchmark/debug bisection; unset, `=1`/`on`/`true` keep barriers enabled. `PERRY_GC_DIAG=1` prints per-cycle diagnostics, including evacuation-policy decisions for considered cycles and `barriers_inactive` skips.
 
diff --git a/Cargo.lock b/Cargo.lock
index a4b7523861..09e3d15f77 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5338,7 +5338,7 @@ checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
 [[package]]
 name = "perry"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "base64",
@@ -5395,14 +5395,14 @@ dependencies = [
 
 [[package]]
 name = "perry-api-manifest"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "perry-audio-miniaudio"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "cc",
  "libc",
@@ -5410,7 +5410,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "log",
@@ -5425,7 +5425,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-arkts"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5434,7 +5434,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-glance"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5442,7 +5442,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-js"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-dispatch",
@@ -5452,7 +5452,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-swiftui"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5461,7 +5461,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-wasm"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "base64",
@@ -5474,7 +5474,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-wear-tiles"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5482,7 +5482,7 @@ dependencies = [
 
 [[package]]
 name = "perry-container-compose"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -5511,14 +5511,14 @@ dependencies = [
 
 [[package]]
 name = "perry-container-e2e"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
 ]
 
 [[package]]
 name = "perry-diagnostics"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "serde",
  "serde_json",
@@ -5526,7 +5526,7 @@ dependencies = [
 
 [[package]]
 name = "perry-dispatch"
-version = "0.5.1222"
+version = "0.5.1223"
 
 [[package]]
 name = "perry-doc-fixture-my-bindings"
@@ -5537,7 +5537,7 @@ dependencies = [
 
 [[package]]
 name = "perry-doc-tests"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "clap",
@@ -5552,7 +5552,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ads"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "block2",
  "objc2",
@@ -5562,7 +5562,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-argon2"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "argon2",
  "perry-ffi",
@@ -5570,7 +5570,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-axios"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "reqwest",
@@ -5579,7 +5579,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-bcrypt"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bcrypt",
  "perry-ffi",
@@ -5587,7 +5587,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-better-sqlite3"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "rusqlite",
@@ -5595,7 +5595,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-cheerio"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "scraper",
@@ -5603,7 +5603,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-commander"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5611,7 +5611,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-cron"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "chrono",
  "cron",
@@ -5621,7 +5621,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-dayjs"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5629,7 +5629,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-decimal"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "rust_decimal",
@@ -5637,7 +5637,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-dotenv"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "serde_json",
@@ -5645,7 +5645,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ethers"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "rand 0.8.6",
@@ -5653,7 +5653,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-events"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5661,14 +5661,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-exponential-backoff"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-fastify"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bytes",
  "http-body-util",
@@ -5686,7 +5686,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-fetch"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bytes",
  "lazy_static",
@@ -5699,7 +5699,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-http"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bytes",
  "lazy_static",
@@ -5713,7 +5713,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-http-server"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bytes",
  "h2",
@@ -5736,7 +5736,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ioredis"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -5746,7 +5746,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-jsonwebtoken"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "jsonwebtoken",
@@ -5757,7 +5757,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-lru-cache"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "lru",
  "perry-ffi",
@@ -5765,7 +5765,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-moment"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5773,7 +5773,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-mongodb"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bson",
  "futures-util",
@@ -5785,7 +5785,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-mysql2"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5795,7 +5795,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-nanoid"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "nanoid",
  "perry-ffi",
@@ -5804,7 +5804,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-net"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "bytes",
  "perry-ffi",
@@ -5817,7 +5817,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-nodemailer"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "lettre",
  "perry-ffi",
@@ -5827,7 +5827,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-pdf"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "printpdf",
@@ -5835,7 +5835,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-pg"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "sqlx",
@@ -5844,7 +5844,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ratelimit"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "governor",
  "perry-ffi",
@@ -5852,7 +5852,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-sharp"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "fast_image_resize",
  "image",
@@ -5862,14 +5862,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-slugify"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-streams"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -5878,7 +5878,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-uuid"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "uuid",
@@ -5886,7 +5886,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-validator"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ffi",
  "regex",
@@ -5896,7 +5896,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ws"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "futures-util",
  "lazy_static",
@@ -5908,7 +5908,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-zlib"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "brotli",
  "flate2",
@@ -5917,7 +5917,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ffi"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "dashmap",
  "once_cell",
@@ -5926,7 +5926,7 @@ dependencies = [
 
 [[package]]
 name = "perry-hir"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-api-manifest",
@@ -5944,7 +5944,7 @@ dependencies = [
 
 [[package]]
 name = "perry-parser"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-diagnostics",
@@ -5956,7 +5956,7 @@ dependencies = [
 
 [[package]]
 name = "perry-runtime"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "base64",
@@ -5989,14 +5989,14 @@ dependencies = [
 
 [[package]]
 name = "perry-runtime-static"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-runtime",
 ]
 
 [[package]]
 name = "perry-stdlib"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "aes 0.8.4",
  "aes-gcm",
@@ -6089,14 +6089,14 @@ dependencies = [
 
 [[package]]
 name = "perry-stdlib-static"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-stdlib",
 ]
 
 [[package]]
 name = "perry-transform"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -6106,7 +6106,7 @@ dependencies = [
 
 [[package]]
 name = "perry-types"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "anyhow",
  "thiserror 1.0.69",
@@ -6114,14 +6114,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ui"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ui-model",
 ]
 
 [[package]]
 name = "perry-ui-android"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "itoa",
@@ -6138,7 +6138,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-geisterhand"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "rand 0.8.6",
  "serde",
@@ -6148,7 +6148,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-gtk4"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "cairo-rs 0.22.0",
@@ -6171,7 +6171,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-ios"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "block2",
@@ -6187,7 +6187,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-macos"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "block2",
@@ -6202,7 +6202,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-model"
-version = "0.5.1222"
+version = "0.5.1223"
 
 [[package]]
 name = "perry-ui-test"
@@ -6210,11 +6210,11 @@ version = "0.1.0"
 
 [[package]]
 name = "perry-ui-testkit"
-version = "0.5.1222"
+version = "0.5.1223"
 
 [[package]]
 name = "perry-ui-tvos"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "block2",
@@ -6230,7 +6230,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-visionos"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "block2",
@@ -6246,7 +6246,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-watchos"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "block2",
  "libc",
@@ -6259,7 +6259,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-windows"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "libc",
@@ -6276,14 +6276,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-windows-winui"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "perry-ui-windows",
 ]
 
 [[package]]
 name = "perry-updater"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "base64",
  "ed25519-dalek",
@@ -6297,7 +6297,7 @@ dependencies = [
 
 [[package]]
 name = "perry-wasm-host"
-version = "0.5.1222"
+version = "0.5.1223"
 dependencies = [
  "wasmi",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 19b00f492b..37e9e6b77a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -301,7 +301,7 @@ strip = false
 codegen-units = 16
 
 [workspace.package]
-version = "0.5.1222"
+version = "0.5.1223"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/PerryTS/perry"
diff --git a/docs/src/language/limitations.md b/docs/src/language/limitations.md
index 8e4ae2b619..adfd72216d 100644
--- a/docs/src/language/limitations.md
+++ b/docs/src/language/limitations.md
@@ -165,20 +165,30 @@ but user-written modules should use static `import` declarations.
 > dynamic `require()`, etc.), but plain JavaScript projects compile and run in
 > most cases.
 
-## Limited Prototype Manipulation
+## Prototype Manipulation
 
-Perry compiles classes to fixed structures. Dynamic prototype modification is not supported:
+Dynamic prototype manipulation is supported for the common patterns:
 
-<!-- intentionally-rejects: this snippet documents code Perry refuses to compile -->
-```text
-// Not supported
-MyClass.prototype.newMethod = function() {};
-Object.setPrototypeOf(obj, proto);
+```ts
+// Supported
+MyClass.prototype.newMethod = function () {};   // prototype method assignment
+Object.setPrototypeOf(obj, proto);              // incl. chains of any length
+Object.setPrototypeOf(Derived, Base);           // transpiled __extends statics link
+Object.getPrototypeOf(obj);                     // inspection
 ```
 
-`Object.getPrototypeOf(...)` and `Reflect.getPrototypeOf(...)` are supported
-for class/prototype inspection patterns, but `Object.setPrototypeOf(...)` /
-`Reflect.setPrototypeOf(...)` do not mutate Perry's fixed class layout.
+Prototype-method assignment routes through a dedicated registry
+(`CLASS_PROTOTYPE_METHODS`) and `Object.setPrototypeOf` performs a real,
+cycle-checked prototype mutation (a genuine cycle still throws `TypeError`).
+
+Remaining known gaps:
+
+- the assignment form `obj.__proto__ = x` on the dynamic write path stores a
+  literal `"__proto__"` property instead of setting the prototype (use
+  `Object.setPrototypeOf`);
+- an object-literal `{ __proto__: [] }` sets the prototype without throwing,
+  but the result is not yet visible to `instanceof` (`… instanceof Array`
+  reports `false`).
 
 ## Weak References Retain Their Targets
 
diff --git a/docs/src/packages/porting.md b/docs/src/packages/porting.md
index 4e41e60864..28a9fca703 100644
--- a/docs/src/packages/porting.md
+++ b/docs/src/packages/porting.md
@@ -11,7 +11,7 @@ Perry compiles a practical subset of TypeScript. Most pure TS/JS packages can be
 | Package uses Node native addons (`.node` files, `binding.gyp`, `prebuilds/`, `node-gyp`) | **Don't put it in `compilePackages`.** Find a pure JS/TS alternative, or replace the native boundary with a Perry native binding (`perry.nativeLibrary`). |
 | Package is pure TS/JS with only light use of dynamic features | **Good candidate.** Add to `compilePackages`, patch whatever trips the compiler. |
 | Package's core API is built on `Proxy` (ORMs, validation DSLs, reactive stores) | **Probably not portable.** The surface Perry-users touch is the Proxy. |
-| Package is pure TS/JS but uses lookbehind regex, `Symbol`, `WeakMap`, etc. | **Patchable.** See [Common gaps](#common-gaps) below. |
+| Package is pure TS/JS but uses `Symbol`, `WeakMap`, `console.dir`, etc. | **Patchable.** See [Common gaps](#common-gaps) below. |
 
 ## Native addon packages
 
@@ -96,16 +96,11 @@ Perry's [full limitations list](../language/limitations.md) is the canonical ref
 
 ### Lookbehind regex
 
-Perry uses Rust's `regex` crate, which doesn't support lookbehind (`(?<=…)` / `(?<!…)`).
-
-```text
-// Not supported
-str.match(/(?<=prefix)\w+/);
-
-// Rewrite — capture the prefix and slice
-const m = str.match(/prefix(\w+)/);
-const rest = m ? m[1] : null;
-```
+Supported. Perry compiles with Rust's `regex` crate first and transparently
+falls back to `fancy-regex` for patterns the fast engine can't express —
+lookbehind (`(?<=…)` / `(?<!…)`), lookahead, and backreferences — including
+capture-group translation and replacement-string expansion. No rewrite is
+needed when porting a package that uses them.
 
 ### `Symbol`
 
@@ -180,8 +175,8 @@ Please:
 1. Read the package at node_modules/<NAME>/. Check package.json for
    native addons (binding.gyp, gypfile, prebuilds/ — stop if present).
 2. Scan for unsupported constructs: eval, new Function, dynamic require,
-   Symbol, Proxy, WeakMap, WeakRef, Reflect, decorators, lookbehind
-   regex (?<= / ?<!), Object.setPrototypeOf, computed property keys.
+   Symbol, Proxy, WeakMap, WeakRef, Reflect, decorators, computed
+   property keys.
 3. Report a triage: what rules the package out vs. what's patchable.
 4. If patchable: add the package to perry.compilePackages in
    package.json, apply minimal localized patches, and record each