The combined sourcemap has paths.len + 1 sources:
- Index 0: HMR Runtime ("bun://Bun/Bun HMR Runtime")
- Indices 1 to paths.len: User files from the paths array
When parsing the sourcemap for error remapping, only paths.len was
passed as the source count, causing the last file's source index to
fail validation (source_index >= sources_count).
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Co-Authored-By: Claude <noreply@anthropic.com>
## Summary
- Implements the `%j` format specifier for `console.log` and related
console methods
- `%j` outputs the JSON stringified representation of the value
- Previously, `%j` was not recognized and was left as literal text in
the output
## Test plan
- [x] Run `bun bd test test/regression/issue/24234.test.ts` - all 5
tests pass
- [x] Verify tests fail with system Bun (`USE_SYSTEM_BUN=1`) to confirm
fix validity
- [x] Manual verification: `console.log('%j', {foo: 'bar'})` outputs
`{"foo":"bar"}`
## Example
Before (bug):
```
$ bun -e "console.log('%j %s', {foo: 'bar'}, 'hello')"
%j [object Object] hello
```
After (fixed):
```
$ bun -e "console.log('%j %s', {foo: 'bar'}, 'hello')"
{"foo":"bar"} hello
```
Closes#24234🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Add proper bounds checking for encoding operations that produce larger
output than input
- Handle allocation failures gracefully by returning appropriate errors
- Add defensive checks in string initialization functions
## Test plan
- Added test case for encoding operations with large buffers
- Verified existing buffer tests still pass
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Co-authored-by: Claude <noreply@anthropic.com>
## Summary
Implements the [URLPattern Web
API](https://developer.mozilla.org/en-US/docs/Web/API/URLPattern) based
on WebKit's implementation. URLPattern provides declarative pattern
matching for URLs, similar to how regular expressions work for strings.
### Features
- **Constructor**: Create patterns from strings or `URLPatternInit`
dictionaries
- **`test()`**: Check if a URL matches the pattern (returns boolean)
- **`exec()`**: Extract matched groups from a URL (returns
`URLPatternResult` or null)
- **Pattern properties**: `protocol`, `username`, `password`,
`hostname`, `port`, `pathname`, `search`, `hash`
- **`hasRegExpGroups`**: Detect if the pattern uses custom regular
expressions
### Example Usage
```js
// Match URLs with a user ID parameter
const pattern = new URLPattern({ pathname: '/users/:id' });
pattern.test('https://example.com/users/123'); // true
pattern.test('https://example.com/posts/456'); // false
const result = pattern.exec('https://example.com/users/123');
console.log(result.pathname.groups.id); // "123"
// Wildcard matching
const filesPattern = new URLPattern({ pathname: '/files/*' });
const match = filesPattern.exec('https://example.com/files/image.png');
console.log(match.pathname.groups[0]); // "image.png"
```
## Implementation Notes
- Adapted from WebKit's URLPattern implementation
- Modified JS bindings to work with Bun's infrastructure (simpler
`convertDictionary` patterns, WTF::Variant handling)
- Added IsoSubspaces for proper GC integration
## Test Plan
- [x] 408 tests from Web Platform Tests pass
- [x] Tests fail with system Bun (URLPattern not defined), pass with
debug build
- [x] Manual testing of basic functionality
Fixes https://github.com/oven-sh/bun/issues/2286🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
# What does this PR do?
Nyaa~ This PR fixes a small mistake in the documentation where the code
block for a React component test example was using the wrong filename!
(；ω；)💦
It was previously labeled as `matchers.d.ts`, but it should be something
like `myComponent.test.tsx` to properly reflect a test file for a React
component using `@testing-library/react`. 🧁✨
This makes the example clearer and more accurate for developers using
Bun to test their React components~! 💻🌸💕
# How did you verify your code works?
It's just docs, one single line 🥺
Pwease review and merge it when you can, senpai~~! UwU 🌈🫧
## Summary
- Add documentation for the `env` option that inlines `process.env.*`
values in frontend code when bundling HTML files
- Document runtime configuration via `bunfig.toml` `[serve.static]`
section for `bun ./index.html`
- Document production build configuration via CLI (`--env=PUBLIC_*`) and
`Bun.build` API (`env: "PUBLIC_*"`)
- Explain prefix filtering to avoid exposing sensitive environment
variables
## Test plan
- [x] Verify documentation renders correctly in local preview
- [x] Cross-reference with existing `env` documentation in
bundler/index.mdx
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---------
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Fix `bun publish --help` showing incorrect `--dry-run` description
("Don't install anything" → "Perform a dry run without making changes")
- The `--dry-run` flag is in a shared params array used by multiple
commands, so the new generic message works for all of them
Fixes#24806
## Test plan
- [x] Verify `bun publish --help` shows "Perform a dry run without
making changes" for --dry-run
- [x] Regression test added that validates the correct help text is
shown
- [x] Test passes with debug build, fails with system bun (validating it
tests the right thing)
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---------
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Co-authored-by: Claude <noreply@anthropic.com>
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## Summary
- Make `Http2Server.setTimeout()` and `Http2SecureServer.setTimeout()`
return `this` to enable method chaining
- Matches Node.js behavior where `server.setTimeout(1000).listen()`
works
Fixes#24924
## Test plan
- [x] Test that `Http2Server.setTimeout()` returns server instance
- [x] Test that `Http2SecureServer.setTimeout()` returns server instance
- [x] Test method chaining works (e.g.,
`server.setTimeout(1000).close()`)
- [x] Tests pass with debug build, fail with system bun
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---------
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## Summary
- Adds stricter validation for chunk boundaries in the HTTP chunked
transfer encoding parser
- Ensures conformance with RFC 9112 requirements for chunk formatting
- Adds additional test coverage for chunked encoding edge cases
## Test plan
- Added new tests in `test/js/bun/http/request-smuggling.test.ts`
- All existing HTTP tests pass
- `bun bd test test/js/bun/http/request-smuggling.test.ts` passes
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Extends `fetch()` proxy option to accept an object format: `proxy: {
url: string, headers?: Headers }`
- Allows sending custom headers to the proxy server (useful for proxy
authentication, custom routing headers, etc.)
- Headers are sent in CONNECT requests (for HTTPS targets) and direct
proxy requests (for HTTP targets)
- User-provided `Proxy-Authorization` header overrides auto-generated
credentials from URL
## Usage
```typescript
// Old format (still works)
fetch(url, { proxy: "http://proxy.example.com:8080" });
// New object format with headers
fetch(url, {
proxy: {
url: "http://proxy.example.com:8080",
headers: {
"Proxy-Authorization": "Bearer token",
"X-Custom-Proxy-Header": "value"
}
}
});
```
## Test plan
- [x] Test proxy object with url string works same as string proxy
- [x] Test proxy object with headers sends headers to proxy (HTTP
target)
- [x] Test proxy object with headers sends headers in CONNECT request
(HTTPS target)
- [x] Test proxy object with Headers instance
- [x] Test proxy object with empty headers
- [x] Test proxy object with undefined headers
- [x] Test user-provided Proxy-Authorization overrides URL credentials
- [x] All existing proxy tests pass (25 total)
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---------
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Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Fix crash in `FormData.from()` when called with very large ArrayBuffer
input
- Add length check in C++ `toString` function against both Bun's
synthetic limit and WebKit's `String::MaxLength`
- For UTF-8 tagged strings, use simdutf to calculate actual UTF-16
length only when byte length exceeds the limit
## Root Cause
When `FormData.from()` was called with a very large ArrayBuffer (e.g.,
`new Uint32Array(913148244)` = ~3.6GB), the code would crash with:
```
ASSERTION FAILED: data.size() <= MaxLength
vendor/WebKit/Source/WTF/wtf/text/StringImpl.h(886)
```
The `toString()` function in `helpers.h` was only checking against
`Bun__stringSyntheticAllocationLimit` (which defaults to ~4GB), but not
against WebKit's `String::MaxLength` (INT32_MAX, ~2GB). When the input
exceeded `String::MaxLength`, `createWithoutCopying()` would fail with
an assertion.
## Changes
1. **helpers.h**: Added `|| str.len > WTF::String::MaxLength` checks to
all three code paths in `toString()`:
- UTF-8 tagged pointer path (with simdutf length calculation only when
needed)
- External pointer path
- Non-copying creation path
2. **url.zig**: Reverted the incorrect Zig-side check (UTF-8 byte length
!= UTF-16 character length)
## Test plan
- [x] Added test that verifies FormData.from with oversized input
doesn't crash
- [x] Verified original crash case now returns empty FormData instead of
crashing:
```js
const v3 = new Uint32Array(913148244);
FormData.from(v3); // No longer crashes
```
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
## Summary
- Fix assertion failure in `Bun.mmap` when `offset` or `size` options
are non-numeric values
- Add validation to reject negative `offset`/`size` with clear error
messages
Minimal reproduction: `Bun.mmap("", { offset: null });`
## Root Cause
`Bun.mmap` was calling `toInt64()` directly on the `offset` and `size`
options without validating they are numbers first. `toInt64()` has an
assertion that the value must be a number or BigInt, which fails when
non-numeric values like `null` or functions are passed.
## Test plan
- [x] Added tests for negative offset/size rejection
- [x] Added tests for non-number inputs (null, undefined)
- [x] `bun bd test test/js/bun/util/mmap.test.js` passes
Closes ENG-22413
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Fix debug assertion failure in `JSWrappingFunction` when
`expect.extend()` is called with objects containing non-`JSFunction`
callables
- The crash occurred because `jsCast<JSFunction*>` was used, which
asserts the value inherits from `JSFunction`, but callable class
constructors (like `Expect`) inherit from `InternalFunction` instead
## Changes
- Change `JSWrappingFunction` to store `JSObject*` instead of
`JSFunction*`
- Use `jsDynamicCast` instead of `jsCast` in `getWrappedFunction`
- Use `getObject()` instead of `jsCast` in `create()`
## Reproduction
```js
const jest = Bun.jest();
jest.expect.extend(jest);
```
Before fix (debug build):
```
ASSERTION FAILED: !from || from->JSCell::inherits(std::remove_pointer<To>::type::info())
JSCast.h(40) : To JSC::jsCast(From *) [To = JSC::JSFunction *, From = JSC::JSCell]
```
After fix: Properly throws `TypeError: expect.extend: 'jest' is not a
valid matcher`
## Test plan
- [x] Added regression test
`test/regression/issue/fuzzer-ENG-22942.test.ts`
- [x] Existing `expect-extend.test.js` tests pass (27 tests)
- [x] Build succeeds
Fixes ENG-22942
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
Fixes#23292
`fs.access()` and `fs.accessSync()` threw EUNKNOWN (-134) when checking
named pipes on Windows (paths like `\.\pipe\name`), but Node.js worked
fine.
**Repro:**
```ts
// Server creates pipe at \.\pipe\bun-test
import net from 'net';
const server = net.createServer();
server.listen('\\.\pipe\bun-test');
// Client tries to check if pipe exists
import fs from 'fs';
fs.accessSync('\\.\pipe\bun-test', fs.constants.F_OK);
// Error: EUNKNOWN: unknown error, access '\.\pipe\bun-test'
```
## Root Cause
The `osPathKernel32` function normalizes paths before passing to Windows
APIs. The normalization logic treats a single `.` as a "current
directory" component and removes it, so `\.\pipe\name` incorrectly
became `\pipe\name` - an invalid path.
## Solution
Detect Windows device paths (starting with `\.\` or `\?\`) and skip
normalization for these special paths, preserving the device prefix.
## Test Plan
- [x] Added regression test `test/regression/issue/23292.test.ts`
- [x] Test fails with system bun (v1.3.3): 3 failures (EUNKNOWN)
- [x] Test passes with fix: 4 pass
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---------
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Add `cpu_profile` and `heap_snapshot` counters to `Analytics.Features`
- Export `heap_snapshot` to C++ as `Bun__Feature__heap_snapshot`
- Increment `cpu_profile` when `--cpu-prof` flag is used
- Increment `heap_snapshot` in all heap snapshot creation locations:
- `Bun.generateHeapSnapshot()`
- `bun:jsc` `generateHeapSnapshotForDebugging()`
- `console.takeHeapSnapshot()`
- Internal `JSC__JSGlobalObject__generateHeapSnapshot()`
## Test plan
- [x] Build succeeds
- [x] Heap snapshot generation works
- [x] CPU profiling works with `--cpu-prof`
- [x] Existing tests pass: `test/js/bun/util/v8-heap-snapshot.test.ts`
- [x] Existing tests pass: `test/cli/run/cpu-prof.test.ts`
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---------
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Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Added `http_client_proxy` counter to `analytics.Features` struct
- Incremented counter in `ProxyTunnel.onOpen()` when proxy tunnel
connection opens successfully
This allows tracking HTTP client proxy usage in analytics/crash reports
alongside other features like `fetch`, `WebSocket`, `http_server`, etc.
## Test plan
- [x] Build completes successfully (`bun bd`)
- [x] Existing proxy tests pass (`bun bd test
test/js/bun/http/proxy.test.ts`)
- [x] Counter is properly integrated into the analytics framework
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
Fixes a crash (ENG-22243) where calling class constructors marked with
`call: false` would create invalid instances instead of throwing an
error.
## Root Cause
When a class definition has `call: false` (like `Bun.RedisClient`), the
code generator was still allowing the constructor to be invoked without
`new`. This created invalid instances that caused a buffer overflow
during garbage collection.
## The Fix
Modified `src/codegen/generate-classes.ts` to properly check the `call`
property:
- When `call: false`: throws `TypeError: Class constructor X cannot be
invoked without 'new'`
- When `call: true`: behaves as before, allowing construction without
`new`
## Test Plan
- [x] Added regression test in `test/regression/issue/22243.test.ts`
- [x] Test fails with system bun (has the bug)
- [x] Test passes with fixed build
- [x] Verified `Bun.RedisClient()` now throws proper error
- [x] Verified `new Bun.RedisClient()` still works
## Before
```bash
$ bun -e "Bun.RedisClient()"
# Creates invalid instance, no error
```
## After
```bash
$ bun -e "Bun.RedisClient()"
TypeError: Class constructor RedisClient cannot be invoked without 'new'
```
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
### What does this PR do?
- Bumps some packages
- Does some _best practices_ in certain areas to minimize Aikido noise.
### How did you verify your code works?
CI.
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## Summary
- Fix `spyOn` crash when using indexed property keys (e.g., `spyOn(arr,
0)`)
## Test plan
- [x] Added tests for `spyOn` with numeric indexed properties
- [x] Added tests for `spyOn` with string indexed properties (e.g.,
`"0"`)
- [x] All existing `spyOn` tests pass
- [x] Full `mock-fn.test.js` test suite passes
Fixes ENG-21973
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
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## Summary
- Fix assertion failure when `Bun.indexOfLine` is called with a
non-number offset argument
- Changed from `.to(u32)` to `.coerce(i32, globalThis)` for proper
JavaScript type coercion
## Test plan
- [x] Added regression test in `test/js/bun/util/index-of-line.test.ts`
- [x] `bun bd test test/js/bun/util/index-of-line.test.ts` passes
Closes ENG-21997
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Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
## Summary
- Fix off-by-one error in `preprocessUpdateRequests` where the bounds
check used `>` instead of `>=` when validating package IDs from the
resolution buffer
- When `old_resolution == packages.len`, the check `> packages.len`
passes but `resolutions_of_yore[old_resolution]` is out of bounds since
valid indices are `0` to `packages.len-1`
- This causes an internal assertion failure during `bun install` with
update requests
## The Bug
```zig
// BEFORE (buggy) - at lockfile.zig:484 and :522
if (old_resolution > old.packages.len) continue;
const res = resolutions_of_yore[old_resolution]; // OOB when old_resolution == packages.len
// AFTER (fixed)
if (old_resolution >= old.packages.len) continue;
const res = resolutions_of_yore[old_resolution]; // Now safe
```
## Crash Report
From
[bun.report](https://bun.report/1.3.3/wi1274e01cAggkggB+rt/F+pvBiw3rDqul/Doyi4Emzi5Ewj44FuvbgjMog00yDCYKERNEL32.DLLut0LCSntdll.dll4zijBA0eNrzzCtJLcpLzFFILC5OLSrJzM9TSEvMzCktSgUAiSkKPg/view):
```
panic: Internal assertion failure
- lockfile.zig:523: preprocessUpdateRequests
- install_with_manager.zig:605: installWithManager
- updatePackageJSONAndInstall.zig:340
Features: extracted_packages, text_lockfile
```
## Test plan
- [x] `bun run zig:check` passes
- [ ] CI passes
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## Summary
- Skip 2 tests that use `grpctest.kleinsch.com` (domain no longer
exists)
- Fix flaky "should not keep repeating failed resolutions" test
These tests were originally skipped when added in #14286, but were
accidentally un-skipped in #20051. This restores them to match upstream
grpc-node.
## To re-enable these tests in the future
Bun could set up its own DNS TXT record at `*.bun.sh`. According to the
[gRPC A2
spec](https://github.com/grpc/proposal/blob/master/A2-service-configs-in-dns.md):
**DNS Setup needed:**
1. A record: `grpctest.bun.sh` → any valid IP (e.g., `127.0.0.1`)
2. TXT record: `_grpc_config.grpctest.bun.sh` with value:
```
grpc_config=[{"serviceConfig":{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"service":"MyService","method":"Foo"}],"waitForReady":true}]}}]
```
Then update the tests to use `grpctest.bun.sh` instead.
## Test plan
- [x] `bun bd test test/js/third_party/grpc-js/test-resolver.test.ts`
passes (20 pass, 3 skip, 1 todo, 0 fail)
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
### What does this PR do?
We can't use globalThis.takeException() because it throws out of memory
error when we instead need to take the exception.
### How did you verify your code works?
## Summary
- Fixed boundary check in `String.zig` to use `>=` instead of `>` for
`max_length()` comparisons
- Strings fail when the length is exactly equal to `max_length()`, not
just when exceeding it
- This affects both `createExternal` and
`createExternalGloballyAllocated` functions
## Test plan
- Existing tests should continue to pass
- Strings with length exactly equal to `max_length()` will now be
properly rejected
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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
- Fixed a typo in `makeComponent` that incorrectly identified
2-character patterns starting with `.` (like `.*`) as `..` (DotBack)
patterns
- The condition checked `pattern[component.start] == '.'` twice instead
of checking both characters at positions 0 and 1
- This caused patterns like `.*/*` to be parsed as `../` + `*`, making
the glob walker traverse into parent directories
Fixes#24936
## Test plan
- [x] Added tests in `test/js/bun/glob/scan.test.ts` that verify
patterns like `.*/*` and `.*/**/*.ts` don't escape the cwd boundary
- [x] Tests fail with system bun (bug reproduced) and pass with the fix
- [x] All existing glob tests pass (169 tests)
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
### What does this PR do?
Removes a TODO
### How did you verify your code works?
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
## What does this PR do?
Adds missing documentation for features introduced in Bun v1.3.2 and
v1.3.3:
- **Standalone executable config flags**
(`docs/bundler/executables.mdx`): Document
`--no-compile-autoload-dotenv` and `--no-compile-autoload-bunfig` flags
that control automatic config file loading in compiled binaries
- **Test retry/repeats** (`docs/test/writing-tests.mdx`): Document the
`retry` and `repeats` test options for handling flaky tests
- **Disable env file loading**
(`docs/runtime/environment-variables.mdx`): Document `--no-env-file`
flag and `env = false` bunfig option
## How did you verify your code works?
- [x] Verified documentation is accurate against source code
implementation in `src/cli/Arguments.zig`
- [x] Verified features are not already documented elsewhere
- [x] Cross-referenced with v1.3.2 and v1.3.3 release notes
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Co-authored-by: Claude <noreply@anthropic.com>
