From fa11424e5f3351bc2e8b244243735651b1baca8e Mon Sep 17 00:00:00 2001
From: Chris Tate <chris@ctate.dev>
Date: Sun, 11 Oct 2026 17:25:14 -0500
Subject: [PATCH 1/2] Prepare v0.2.9

---
 CHANGELOG.md                                  | 27 +++++++++++++++++--
 docs/content/docs/coverage.mdx                |  2 +-
 packages/cli-darwin-arm64/package.json        |  2 +-
 packages/cli-darwin-x64/package.json          |  2 +-
 packages/cli-linux-arm64-gnu/package.json     |  2 +-
 packages/cli-linux-arm64-musl/package.json    |  2 +-
 packages/cli-linux-x64-gnu/package.json       |  2 +-
 packages/cli-linux-x64-musl/package.json      |  2 +-
 packages/cli-win32-x64-msvc/package.json      |  2 +-
 packages/cli/package.json                     |  2 +-
 packages/compiler/package.json                |  2 +-
 packages/compiler/surface-manifest.json       |  2 +-
 packages/llvm-darwin-arm64/package.json       |  2 +-
 packages/llvm-darwin-x64/package.json         |  2 +-
 packages/llvm-linux-arm64-gnu/package.json    |  2 +-
 packages/llvm-linux-arm64-musl/package.json   |  2 +-
 packages/llvm-linux-x64-gnu/package.json      |  2 +-
 packages/llvm-linux-x64-musl/package.json     |  2 +-
 packages/llvm-win32-x64-msvc/package.json     |  2 +-
 packages/runtime-android-arm64/package.json   |  2 +-
 packages/runtime-darwin-arm64/package.json    |  2 +-
 packages/runtime-darwin-x64/package.json      |  2 +-
 packages/runtime-ios-arm64/package.json       |  2 +-
 .../runtime-ios-simulator-arm64/package.json  |  2 +-
 packages/runtime-linux-arm64-gnu/package.json |  2 +-
 .../runtime-linux-arm64-musl/package.json     |  2 +-
 packages/runtime-linux-x64-gnu/package.json   |  2 +-
 packages/runtime-linux-x64-musl/package.json  |  2 +-
 packages/runtime-wasm32-wasi/package.json     |  2 +-
 packages/runtime-win32-x64-msvc/package.json  |  2 +-
 packages/runtime/package.json                 |  2 +-
 packages/threads/package.json                 |  2 +-
 32 files changed, 56 insertions(+), 33 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26bdea424..e94aa68ca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,31 @@ All notable changes to scriptc will be documented in this file.
 
 <!-- release:start -->
 
+## 0.2.9
+
+### Features
+
+- **`os.availableParallelism()` works in static programs.**
+- **`--detached-exit` frees the address space after `process.exit` off the critical path,** so large programs exit sooner.
+
+### Performance
+
+- **Cycle-capable objects are smaller.** A 16-byte collector header, typed rest spreads, leaf capture boxes, rarely used array storage moved out of line, and tracing only types that can actually lie on a cycle.
+- **The heap and cycle collector scale better.** Busy small-object slices use transparent huge pages, the collector's growth fraction widens further on large live heaps, and `Map`/`Set` `clear` and `delete` cost O(live) rather than O(peak).
+- **Indexed reads are cheaper.** Typed-array reads stay plain numbers where `undefined` acts like `NaN`, unproven indexes are checked with a signed round trip, lengths and in-range indexes convert to doubles without the unsigned sequence, nullable-union array elements are read inline, and counted loops that start from an unproven value run on integer counters.
+- **Worker programs pay less overhead.** Fewer termination polls, an exact per-thread pending word, a call-free macOS stack guard, and exiting worker threads return their free pages to the system.
+- **More receivers and fields stay native.** Optional-chain receivers are borrowed, `int32` fields survive `Error` subclasses that forward constructor arguments, and method calls stay native when only an unrelated callback field shares the name.
+- **Compiler-scale programs compile without hitting V8's string limit.** Serialized IR is streamed.
+
+### Fixes
+
+- **More values behave as in Node.js.** Missing array and typed-array reads stay `undefined` through number arguments, narrowed slots and lambda results, and `null` stays distinct from the temporal dead zone in forward-captured bindings.
+- **Union class fields work in more shapes.** Optional base-class receivers are narrowed before shared field access, and fields declared with different types across a union can be read and written.
+- **Workers share descriptor tables safely,** and live array references are accessed one element at a time.
+- **Native program objects use runtime ABI v10.** The collector header changed size, so external object consumers must link the matching v0.2.9 runtime pack; the versioned marker rejects incompatible runtime objects at link time.
+
+<!-- release:end -->
+
 ## 0.2.8
 
 ### Features
@@ -28,8 +53,6 @@ All notable changes to scriptc will be documented in this file.
 - **Debuggers stop only at user code.** Shared helpers no longer appear on user source lines, so a breakpoint on a line stops only at that line's code.
 - **Native program objects use runtime ABI v9.** External object consumers must link the matching v0.2.8 runtime pack; the versioned marker rejects incompatible runtime objects at link time.
 
-<!-- release:end -->
-
 ## 0.2.7
 
 ### Features
diff --git a/docs/content/docs/coverage.mdx b/docs/content/docs/coverage.mdx
index 4f300e11e..571aad875 100644
--- a/docs/content/docs/coverage.mdx
+++ b/docs/content/docs/coverage.mdx
@@ -187,7 +187,7 @@ An unchanged program reuses the previous verdict: coverage records the files and
 {
   "schema": "scriptc-diagnostics",
   "schemaVersion": 1,
-  "compilerVersion": "0.2.8",
+  "compilerVersion": "0.2.9",
   "command": "coverage",
   "entry": "/work/app/src/main.ts",
   "success": false,
diff --git a/packages/cli-darwin-arm64/package.json b/packages/cli-darwin-arm64/package.json
index eb0069acc..e00e9f9a2 100644
--- a/packages/cli-darwin-arm64/package.json
+++ b/packages/cli-darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-darwin-arm64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for darwin-arm64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli-darwin-x64/package.json b/packages/cli-darwin-x64/package.json
index 685567983..da7694127 100644
--- a/packages/cli-darwin-x64/package.json
+++ b/packages/cli-darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-darwin-x64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for darwin-x64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli-linux-arm64-gnu/package.json b/packages/cli-linux-arm64-gnu/package.json
index b92422d85..d6f7214ef 100644
--- a/packages/cli-linux-arm64-gnu/package.json
+++ b/packages/cli-linux-arm64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-linux-arm64-gnu",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for linux-arm64-gnu",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli-linux-arm64-musl/package.json b/packages/cli-linux-arm64-musl/package.json
index 18f0667b5..46e3d7982 100644
--- a/packages/cli-linux-arm64-musl/package.json
+++ b/packages/cli-linux-arm64-musl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-linux-arm64-musl",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for linux-arm64-musl",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli-linux-x64-gnu/package.json b/packages/cli-linux-x64-gnu/package.json
index bce0745e9..f515da505 100644
--- a/packages/cli-linux-x64-gnu/package.json
+++ b/packages/cli-linux-x64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-linux-x64-gnu",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for linux-x64-gnu",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli-linux-x64-musl/package.json b/packages/cli-linux-x64-musl/package.json
index c32d8820c..28a50f5a7 100644
--- a/packages/cli-linux-x64-musl/package.json
+++ b/packages/cli-linux-x64-musl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-linux-x64-musl",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for linux-x64-musl",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli-win32-x64-msvc/package.json b/packages/cli-win32-x64-msvc/package.json
index e9f4b8a2c..7a97df09e 100644
--- a/packages/cli-win32-x64-msvc/package.json
+++ b/packages/cli-win32-x64-msvc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/cli-win32-x64-msvc",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Native scriptc compiler for win32-x64-msvc",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 97010754a..e013e6080 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "scriptc",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Compile ordinary TypeScript and JavaScript to small, fast native executables — no Node, no V8, no JavaScript engine in the binary",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/compiler/package.json b/packages/compiler/package.json
index 60ac2a43d..fb697202b 100644
--- a/packages/compiler/package.json
+++ b/packages/compiler/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/compiler",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "The scriptc compiler — TypeScript/JavaScript frontend, typed IR, LLVM backend",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/compiler/surface-manifest.json b/packages/compiler/surface-manifest.json
index 531a17197..083f7bad8 100644
--- a/packages/compiler/surface-manifest.json
+++ b/packages/compiler/surface-manifest.json
@@ -1,6 +1,6 @@
 {
   "schemaVersion": 1,
-  "compilerVersion": "0.2.8",
+  "compilerVersion": "0.2.9",
   "coverage": [
     "Entries are projected mechanically from the compiler's own decision tables: the diagnostics registry, the unsupported-syntax dispatch tables, the stdlib and node-builtin lowering tables, and the supported-builtin-module list. Nothing is hand-maintained; the manifest regenerates byte-identically from the source tree at this version.",
     "Absence from this manifest means 'not projected', never 'unsupported'. Surfaces lowered through dedicated code paths rather than tables are not yet projected: console, JSON, Promise/async and the timer surface, the net/http/tls/https/dgram/dns/assert/test/stream/readline module member surfaces, template literals, the regex slice, global functions (parseInt, parseFloat, isNaN, isFinite), and the process surface outside its ambient slice.",
diff --git a/packages/llvm-darwin-arm64/package.json b/packages/llvm-darwin-arm64/package.json
index 0411366b2..1d11eb252 100644
--- a/packages/llvm-darwin-arm64/package.json
+++ b/packages/llvm-darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-darwin-arm64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Pinned LLVM code-generation helper for scriptc on macOS arm64",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/llvm-darwin-x64/package.json b/packages/llvm-darwin-x64/package.json
index f82125597..91bb387b8 100644
--- a/packages/llvm-darwin-x64/package.json
+++ b/packages/llvm-darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-darwin-x64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Pinned LLVM code-generation helper for scriptc on macOS x64",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/llvm-linux-arm64-gnu/package.json b/packages/llvm-linux-arm64-gnu/package.json
index 5999c7dad..09e1b3dc4 100644
--- a/packages/llvm-linux-arm64-gnu/package.json
+++ b/packages/llvm-linux-arm64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-linux-arm64-gnu",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Pinned LLVM code-generation helper for scriptc on Linux arm64",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/llvm-linux-arm64-musl/package.json b/packages/llvm-linux-arm64-musl/package.json
index b35e9560d..2a196f380 100644
--- a/packages/llvm-linux-arm64-musl/package.json
+++ b/packages/llvm-linux-arm64-musl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-linux-arm64-musl",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Statically linked LLVM code-generation helper for scriptc on Linux arm64 musl",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/llvm-linux-x64-gnu/package.json b/packages/llvm-linux-x64-gnu/package.json
index 38215d335..0898235d8 100644
--- a/packages/llvm-linux-x64-gnu/package.json
+++ b/packages/llvm-linux-x64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-linux-x64-gnu",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Pinned LLVM code-generation helper for scriptc on Linux x64",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/llvm-linux-x64-musl/package.json b/packages/llvm-linux-x64-musl/package.json
index 3c741d11c..9a99c16fd 100644
--- a/packages/llvm-linux-x64-musl/package.json
+++ b/packages/llvm-linux-x64-musl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-linux-x64-musl",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Statically linked LLVM code-generation helper for scriptc on Linux x64 musl",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/llvm-win32-x64-msvc/package.json b/packages/llvm-win32-x64-msvc/package.json
index e36e92138..4bcae5a98 100644
--- a/packages/llvm-win32-x64-msvc/package.json
+++ b/packages/llvm-win32-x64-msvc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/llvm-win32-x64-msvc",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Pinned LLVM code-generation helper for scriptc on Windows x64",
   "license": "Apache-2.0 WITH LLVM-exception",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-android-arm64/package.json b/packages/runtime-android-arm64/package.json
index f34dcd9ac..815f2c76b 100644
--- a/packages/runtime-android-arm64/package.json
+++ b/packages/runtime-android-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-android-arm64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc library runtime pack for Android arm64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-darwin-arm64/package.json b/packages/runtime-darwin-arm64/package.json
index 91283e733..f701a215c 100644
--- a/packages/runtime-darwin-arm64/package.json
+++ b/packages/runtime-darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-darwin-arm64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for macOS arm64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-darwin-x64/package.json b/packages/runtime-darwin-x64/package.json
index f98a848cb..14f68f212 100644
--- a/packages/runtime-darwin-x64/package.json
+++ b/packages/runtime-darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-darwin-x64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for macOS x64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-ios-arm64/package.json b/packages/runtime-ios-arm64/package.json
index bf1491661..61755f9ce 100644
--- a/packages/runtime-ios-arm64/package.json
+++ b/packages/runtime-ios-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-ios-arm64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc library runtime pack for iOS arm64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-ios-simulator-arm64/package.json b/packages/runtime-ios-simulator-arm64/package.json
index 23d08ba5c..531021975 100644
--- a/packages/runtime-ios-simulator-arm64/package.json
+++ b/packages/runtime-ios-simulator-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-ios-simulator-arm64",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc library runtime pack for iOS simulator arm64",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-linux-arm64-gnu/package.json b/packages/runtime-linux-arm64-gnu/package.json
index 9df175e51..c207e53ef 100644
--- a/packages/runtime-linux-arm64-gnu/package.json
+++ b/packages/runtime-linux-arm64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-linux-arm64-gnu",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for Linux arm64 glibc",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-linux-arm64-musl/package.json b/packages/runtime-linux-arm64-musl/package.json
index 2e2ab24c7..6f401d0f7 100644
--- a/packages/runtime-linux-arm64-musl/package.json
+++ b/packages/runtime-linux-arm64-musl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-linux-arm64-musl",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for Linux arm64 musl",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-linux-x64-gnu/package.json b/packages/runtime-linux-x64-gnu/package.json
index 2bc304d0b..b7039f61b 100644
--- a/packages/runtime-linux-x64-gnu/package.json
+++ b/packages/runtime-linux-x64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-linux-x64-gnu",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for Linux x64 glibc",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-linux-x64-musl/package.json b/packages/runtime-linux-x64-musl/package.json
index 8bd8367e2..ed2c8f68d 100644
--- a/packages/runtime-linux-x64-musl/package.json
+++ b/packages/runtime-linux-x64-musl/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-linux-x64-musl",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for Linux x64 musl",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-wasm32-wasi/package.json b/packages/runtime-wasm32-wasi/package.json
index fb6107af9..80cd4647d 100644
--- a/packages/runtime-wasm32-wasi/package.json
+++ b/packages/runtime-wasm32-wasi/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-wasm32-wasi",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for WASI Preview 1",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime-win32-x64-msvc/package.json b/packages/runtime-win32-x64-msvc/package.json
index 0d85ed544..81815d6a0 100644
--- a/packages/runtime-win32-x64-msvc/package.json
+++ b/packages/runtime-win32-x64-msvc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime-win32-x64-msvc",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Precompiled scriptc runtime pack for Windows x64 MSVC",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/runtime/package.json b/packages/runtime/package.json
index e6ea4b45d..7d43c5741 100644
--- a/packages/runtime/package.json
+++ b/packages/runtime/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/runtime",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "scriptc native runtime sources and vendored dependencies",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",
diff --git a/packages/threads/package.json b/packages/threads/package.json
index 33c874916..ee37918ff 100644
--- a/packages/threads/package.json
+++ b/packages/threads/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/threads",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "Zero-copy publication of immutable object graphs to worker threads (scriptc), with a deep-freezing Node.js implementation",
   "license": "Apache-2.0",
   "homepage": "https://scriptc.dev",

From 6adb753e895b17d1638240c5f4984073bc03f513 Mon Sep 17 00:00:00 2001
From: Chris Tate <chris@ctate.dev>
Date: Sun, 11 Oct 2026 17:32:45 -0500
Subject: [PATCH 2/2] Correct the runtime ABI version in the 0.2.9 notes

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e94aa68ca..3092cff60 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,7 +27,7 @@ All notable changes to scriptc will be documented in this file.
 - **More values behave as in Node.js.** Missing array and typed-array reads stay `undefined` through number arguments, narrowed slots and lambda results, and `null` stays distinct from the temporal dead zone in forward-captured bindings.
 - **Union class fields work in more shapes.** Optional base-class receivers are narrowed before shared field access, and fields declared with different types across a union can be read and written.
 - **Workers share descriptor tables safely,** and live array references are accessed one element at a time.
-- **Native program objects use runtime ABI v10.** The collector header changed size, so external object consumers must link the matching v0.2.9 runtime pack; the versioned marker rejects incompatible runtime objects at link time.
+- **Native program objects use runtime ABI v12.** Runtime object layouts changed, so external object consumers must link the matching v0.2.9 runtime pack; the versioned marker rejects incompatible runtime objects at link time.
 
 <!-- release:end -->