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node:os, CompressionStream, TextEncoder/TextDecoder: remove unsafe - #40244
Jarred-Sumner wants to merge 12 commits into
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WalkthroughSummaryThe changes add append-based encoding helpers, owned Brotli, zlib, and zstd streaming APIs, typed host-export generation, platform OS wrappers, and Rust slice-based text and compression stream interfaces. ChangesRuntime encoding and streaming
Suggested reviewers: Merge Risk: 🟡 Moderate · up to This change refactors OS, encoding, and compression implementations, but the current head does not compile on Android because the platform-specific homedir branch has an invalid match-arm shape. The Android branch should be fixed before merging. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@src/bun_core/string/immutable/unicode.rs`:
- Around line 461-468: Update the unsafe destination handling around
copy_cp1252_into_utf16 so it never constructs a u16 slice over uninitialized
storage. Keep the destination typed as [MaybeUninit<u16>], initialize each
element via MaybeUninit::write while converting the CP1252 bytes, and call
out.set_len only after all elements are initialized.
In `@src/jsc/array_buffer.rs`:
- Around line 176-201: Restrict PinnedArrayBuffer::pin to non-shared buffers
that cannot be concurrently written while the job runs; reject shared and
otherwise unsafe aliasing cases so bytes() never exposes a concurrently mutable
slice. Update the CompressionStreamCoder consumer to use its existing Owned
input variant by copying input when pinning is unavailable, preserving safe
off-thread reads.
In `@src/runtime/webcore/encoding.rs`:
- Around line 586-587: Update construct_from_u8 and the UTF-16, base64-decode,
and hex-decode allocation paths to use fallible Vec reservation, including
replacing or adapting append_latin1_as_utf16_bytes and fill_spare as needed.
Propagate allocation errors through construct_from_u8 before crossing the FFI
boundary, while preserving the existing try_reserve_exact protection for base64
encoding.
In `@src/sys/os.rs`:
- Around line 249-258: Update the cleanup in Drop::drop to convert
self.info_size from integer_t words to bytes before passing it to
libc::vm_deallocate, while preserving the existing address and deallocation
flow.
In `@src/zstd/lib.rs`:
- Around line 843-849: Define a named c::ZSTD_e_end constant alongside
c::ZSTD_e_continue, then update the directive selection in step to use that
constant instead of the literal 2 while preserving c::ZSTD_e_continue for
non-ending steps.
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📒 Files selected for processing (24)
src/base64/lib.rssrc/brotli/lib.rssrc/bun_core/string/immutable.rssrc/bun_core/string/immutable/unicode.rssrc/codegen/generate-host-exports.tssrc/jsc/JSString.rssrc/jsc/array_buffer.rssrc/jsc/bindings/headers-handwritten.hsrc/jsc/bindings/webcore/streams/JSCompressionStreamShared.cppsrc/jsc/bindings/webcore/streams/JSCompressionStreamShared.hsrc/jsc/bindings/webcore/streams/JSTransformStream.hsrc/jsc/lib.rssrc/runtime/node/buffer.rssrc/runtime/node/node_os.rssrc/runtime/webcore/CompressionStreamCoder.rssrc/runtime/webcore/TextDecoder.rssrc/runtime/webcore/TextEncoder.rssrc/runtime/webcore/TextEncoderStreamEncoder.rssrc/runtime/webcore/encoding.rssrc/simdutf_sys/simdutf.rssrc/sys/lib.rssrc/sys/os.rssrc/zlib/lib.rssrc/zstd/lib.rs
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Updated 3:56 PM PT - Sep 6th, 2026
❌ @Jarred-Sumner, your commit d33dce3 has 1 failures in 🧪 To try this PR locally: bunx bun-pr 40244That installs a local version of the PR into your bun-40244 --bun |
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I reviewed this PR and the bug-hunting system found no issues. Because it redesigns CompressionStreamCoder's cross-thread ownership (refcounted → moved Box<Codec> + new __restore handoff), adds a Send PinnedArrayBuffer with VM-gated Drop, and recontracts write_u16 from memmove to non-overlapping slices across the FFI boundary, a human look would still be worthwhile.
What was reviewed:
- Compression codec ownership:
codec.take()→ job →restore()round-trip vs. C++m_asyncCodecInFlightgating;Busyfallback if stepped without codec. write_u16overlap removal — callers pass JS-string chars vs. ArrayBuffer storage, and the two Rust callers (buffer.rsfill,Bun__encoding__writeUTF16) both fit that contract.bun_sys::osRAII wrappers —sockaddr_dlbounds now clamped tosdl_len; nullifa_netmaskhandled; netmask family-stamping ordering ruled out.PinnedArrayBuffer::Dropany-VM check andencode_latin1_intorewrite — both examined and ruled out.
Extended reasoning...
Overview
This PR continues the unsafe-removal programme across six runtime modules (node_os, CompressionStreamCoder, encoding, TextEncoder, TextDecoder, TextEncoderStreamEncoder), reducing their combined unsafe count from ~190 to 2. It does so by introducing safe RAII wrappers in bun_sys::os (getifaddrs, host_processor_info, uv_cpu_info/uv_interface_addresses, getpwuid_r), owned streaming codec types in bun_zlib/bun_brotli/bun_zstd that write into spare capacity, a PinnedArrayBuffer for off-thread ArrayBuffer reads, a JSString::visit<V: StringVisitor> trait, HOST_EXPORT codegen support for &mut [T] and SinkHandle params, and assorted append helpers in base64/simdutf/strings. The C++ side gains CompressionStreamCoder__restore and an updated deliverAsync signature.
Security risks
No new attack surface — this refactors existing FFI paths into safe wrappers. The sockaddr_dl MAC-address read is now bounds-checked against sdl_len (fixing a pre-existing OOB read/panic on macOS for long interface names). The write_u16 change removes memmove semantics; if any caller ever passed overlapping buffers, that would now be UB via copy_from_slice, but the PR documents (and the C++ declarations now state) that source is always JS-string characters and dest is ArrayBuffer storage.
Level of scrutiny
High. The CompressionStreamCoder change is not a mechanical refactor: it replaces ThreadSafeRefCounted (cell + async ctx each hold a ref) with a single owned Box<Codec> that moves out of the coder into the async job and back via restore. This changes what happens on VM teardown mid-job (previously the ctx's ref kept the coder alive; now the job owns the codec and the coder holds None), and adds a new C++/Rust handoff. PinnedArrayBuffer is a new Send type whose Drop releases pin/protect only if a VM exists on the dropping thread. Both are cross-thread lifetime designs that deserve maintainer eyes.
Other factors
The PR touches platform-gated code across linux/macos/freebsd/windows, extends the HOST_EXPORT codegen (which affects every future &mut [T]/SinkHandle export), and rewrites encode_latin1_into's algorithm. Test coverage is extensive per the PR description (ASAN debug builds across os/encoding/compression/buffer suites, plus rust-check-all cross-compile), and two candidate issues raised by finder agents were verified and refuted. But at 24 files with concurrency/FFI/ABI redesign, this is well outside the "simple, mechanical, obvious" bar for auto-approval.
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I reviewed this PR and the bug-hunting pass found no issues; both nits I raised earlier (the AF_UNSPEC netmask copy size and the stale m_coder comment) were addressed. Given the scope — a new off-thread ArrayBuffer pinning type, the CompressionStreamCoder refcount→Box ownership redesign with a C++ hand-back path, several new unsafe impl Sends, and platform-gated syscall wrappers across four OSes — a human look is still warranted.
What was reviewed:
PinnedArrayBufferlifecycle: pin rejects shared/resizable, protect/unprotect paired, Drop is JS-thread-gated;FfiSlicenever re-forms&[u8]over pinned storage.- Codec ownership:
transform_asyncmoves theCodecout anddeliverAsyncrestores it before consuming output; them_asyncCodecInFlightguard on the C++ side still serializes steps. bun_sys::os: RAII drops (freeifaddrs,vm_deallocateword→byte fix,uv_free_*) pair with their allocations;sockaddr_dlMAC read is now bounded bysdl_len.- Spare-capacity append helpers commit only the bytes the codec/simdutf reports, and the hex/latin1 paths write via
MaybeUninit— no uninit reads.
Extended reasoning...
Overview
This PR continues the unsafe-reduction programme across ~27 files: it introduces bun_sys::os (RAII wrappers over getifaddrs, host_processor_info, libuv's CPU/interface lists, getpwuid_r), owned streaming codec types in bun_zlib/bun_brotli/bun_zstd that write into Vec spare capacity, a PinnedArrayBuffer + FfiSlice mechanism for feeding pinned JS-owned bytes to off-thread codecs without forming a Rust reference, a JSString::visit trait for rope iteration, and safe append helpers for hex/base64/simdutf/latin1→utf16. It converts the six webcore encoding/compression files' C exports to HOST_EXPORT codegen (extending the generator for &mut [T] and SinkHandle params), and redesigns CompressionStreamCoder's ownership from ThreadSafeRefCounted to a plain Box whose inner Codec is moved into off-thread steps and returned via a new CompressionStreamCoder__restore C++ hand-back.
Security risks
No new attack surface. The changes are internal refactoring of existing FFI paths; input validation (compressed-stream trailing-junk, decode bounds) is preserved. The FfiSlice::from_raw constructor is unsafe and its only caller (PinnedArrayBuffer::ffi_slice) documents the pin+protect invariant. The write_u16 non-overlap contract that was previously implicit is now documented on both the Rust fn and the C++ declarations.
Level of scrutiny
High. This touches memory-safety-critical code: several new unsafe impl Send (each justified by "plain heap state, only reached via &mut self"), a GC-interaction type whose Drop conditionally leaks off the JS thread, an ownership-model change coordinated across Rust and C++ with a new FFI entry point, and platform-gated syscall wrappers with per-OS pointer arithmetic (sockaddr_dl, sa_len-bounded netmask copies, Mach vm_deallocate). While the diff is largely mechanical unsafe→safe migration and the author reports comprehensive ASAN test coverage, the CompressionStreamCoder redesign and PinnedArrayBuffer are genuine design changes a maintainer should sign off on.
Other factors
The author addressed all five prior review threads (CodeRabbit's vm_deallocate unit fix and ZSTD_e_end naming; my netmask-copy sizing and stale-comment nits; the PinnedArrayBuffer aliasing discussion). Test coverage is stated as extensive (ASAN across os/encoding/compression/buffer/zlib suites plus hand-driven byte-identical checks against system bun on all codec formats). No outstanding unresolved threads. The last author comment is a self-note ("Fix clippy") followed by the two most recent commits.
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Actionable comments posted: 7
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Inline comments:
In `@src/base64/lib.rs`:
- Around line 102-115: Update fill_spare and its callers, including
decode_lenient_append and encode_raw, so spare capacity is exposed as &mut
[MaybeUninit<u8>] or accessed through raw pointers rather than an initialized u8
slice; preserve the existing initialized-length reporting semantics. Change
fill_spare’s reserve path to use handle_oom or unwrap_or_oom in accordance with
the repository OOM contract.
In `@src/brotli/lib.rs`:
- Around line 331-360: Update EncoderStream::step to expose Brotli’s
pending-output state by incorporating BrotliEncoderHasMoreOutput into its
returned Step result. In Codec::run, when finishing, only return Progress::Done
after remaining input is empty, step.avail_out is nonzero, and the encoder
reports no more pending output; otherwise continue draining output.
In `@src/bun_core/lib.rs`:
- Around line 2495-2500: Update FfiSlice::copy_to to use the overlap-safe
core::ptr::copy operation instead of copy_nonoverlapping, while preserving the
existing n calculation, safety guarantees, and returned element count.
In `@src/jsc/array_buffer.rs`:
- Around line 211-218: Update JobPinnedArrayBuffer::ffi_slice so the returned
FfiSlice lifetime is tied to both the JobPinnedArrayBuffer and the Ticket
borrow, ensuring callers cannot retain it after Ticket is dropped. Pass the
Ticket reference through the method’s shared lifetime while preserving the
existing raw-buffer construction and safety guarantees.
In `@src/runtime/node/node_os.rs`:
- Around line 900-911: Update the link-layer interface matching in the
maybe_ll_addr lookup to handle Linux aliases such as eth0:1 when the AF_PACKET
entry is named eth0. Compare the base link-layer name against the requested
alias name, while preserving skip(ll_iface) filtering and existing exact-name
matching behavior.
In `@src/runtime/webcore/CompressionStreamCoder.rs`:
- Around line 544-560: Update AsyncInput::new and the pinned branch of
AsyncInput::ffi_slice so off-thread compression never reads mutable
JavaScript-backed bytes directly; copy the accepted ArrayBuffer/view data into
owned storage, or otherwise use an established immutable snapshot mechanism,
before returning it to the pool-thread codec. Preserve the fallback copy
behavior and FfiSlice interface.
In `@src/runtime/webcore/encoding.rs`:
- Around line 505-511: Update write_u16 to handle overlapping input and output
ranges without panicking, including the UTF-16 copy branch and the narrowing
conversion path. Use overlap-safe move semantics while preserving the existing
encoding, partial-write, and returned-length behavior.
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📒 Files selected for processing (27)
src/base64/lib.rssrc/brotli/lib.rssrc/bun_core/lib.rssrc/bun_core/string/immutable.rssrc/bun_core/string/immutable/unicode.rssrc/codegen/generate-host-exports.tssrc/highway/lib.rssrc/jsc/JSString.rssrc/jsc/array_buffer.rssrc/jsc/bindings/headers-handwritten.hsrc/jsc/bindings/webcore/streams/JSCompressionStream.hsrc/jsc/bindings/webcore/streams/JSCompressionStreamShared.cppsrc/jsc/bindings/webcore/streams/JSCompressionStreamShared.hsrc/jsc/bindings/webcore/streams/JSTransformStream.hsrc/jsc/lib.rssrc/runtime/node/buffer.rssrc/runtime/node/node_os.rssrc/runtime/webcore/CompressionStreamCoder.rssrc/runtime/webcore/TextDecoder.rssrc/runtime/webcore/TextEncoder.rssrc/runtime/webcore/TextEncoderStreamEncoder.rssrc/runtime/webcore/encoding.rssrc/simdutf_sys/simdutf.rssrc/sys/lib.rssrc/sys/os.rssrc/zlib/lib.rssrc/zstd/lib.rs
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Inline comments:
In `@src/base64/lib.rs`:
- Line 730: Update all test calls to Base64DecoderWithIgnore::decode at the
identified call sites to pass mutable [MaybeUninit<u8>] storage instead of [u8].
Convert or access the destination with the appropriate MaybeUninit helper, and
read only the returned written prefix when asserting decoded output.
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src/base64/lib.rssrc/boringssl/lib.rssrc/boringssl_sys/lib.rssrc/brotli/lib.rssrc/bun_core/lib.rssrc/bun_core/string/immutable.rssrc/bun_core/string/immutable/unicode.rssrc/codegen/generate-host-exports.tssrc/highway/lib.rssrc/jsc/JSString.rssrc/jsc/NodeCompileCache.rssrc/jsc/array_buffer.rssrc/jsc/bindings/headers-handwritten.hsrc/jsc/bindings/webcore/streams/JSCompressionStream.hsrc/jsc/bindings/webcore/streams/JSCompressionStreamShared.cppsrc/jsc/bindings/webcore/streams/JSCompressionStreamShared.hsrc/jsc/bindings/webcore/streams/JSTransformStream.hsrc/jsc/lib.rssrc/runtime/cli/publish_command.rssrc/runtime/node/buffer.rssrc/runtime/node/node_crypto_binding.rssrc/runtime/node/node_os.rssrc/runtime/webcore/CompressionStreamCoder.rssrc/runtime/webcore/TextDecoder.rssrc/runtime/webcore/TextEncoder.rssrc/runtime/webcore/TextEncoderStreamEncoder.rssrc/runtime/webcore/encoding.rssrc/simdutf_sys/simdutf.rssrc/sql_jsc/postgres/DataCell.rssrc/sys/lib.rssrc/sys/os.rssrc/zlib/lib.rssrc/zstd/lib.rstest/js/web/streams/compression.test.ts
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Inline comments:
In `@src/runtime/node/node_os.rs`:
- Around line 642-651: Add an explicit return inside both cfg-gated blocks in
the Ok(None) match arm, including the Android BunString path and the non-Android
ENOENT throw path, so each configuration returns JsResult<BunString> directly
and the match remains type-correct.
In `@test/js/web/streams/compression.test.ts`:
- Line 357: Replace the parameterized test.each call for the compression formats
with describe.each, and move the round-trip assertion into an inner test block
while preserving the existing format cases and test behavior.
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src/runtime/node/node_os.rssrc/runtime/webcore/TextDecoder.rssrc/sys/lib.rstest/js/web/streams/compression.test.ts
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node_os.rs, CompressionStreamCoder.rs, encoding.rs, TextDecoder.rs,
TextEncoder.rs and TextEncoderStreamEncoder.rs no longer contain unsafe
blocks; the FFI they needed moves into typed primitives one layer down:
- bun_sys::os: owning wrappers for getifaddrs(3), host_processor_info,
getpwuid_r, getloadavg and the libuv cpu/interface/uname/uptime/homedir
calls, lending typed entries and net::Address values
- bun_zlib::{DeflateEncoder,InflateDecoder}::step_into_spare,
bun_brotli::{EncoderStream,DecoderStream}, bun_zstd::{CompressStream,
DecompressStream}: one codec call into a Vec's spare capacity with an
output limit
- bun_jsc: PinnedArrayBuffer (pinned + protected bytes for a pool job),
external_string_utf16, JSString::visit with a StringVisitor trait
- bun_simdutf utf16->utf8 le_append, bun_base64 encode_url_safe_append /
decode_lenient_append
- generate-host-exports: `&mut [T]` and `SinkHandle` parameters, so the
C++-called entry points are HOST_EXPORTs over safe signatures
CompressionStreamCoder is now a Box owned by the C++ cell; an off-thread
step takes the codec state by value and hands it back through
Bun__CompressionStream__deliverAsync -> CompressionStreamCoder__restore,
so no refcount is shared across threads. On macOS the interface MAC is
read from the full sockaddr_dl (long interface names no longer index past
sdl_data), and a null ifa_netmask reads as an all-zero mask like libuv.
Buffer.from(str, 'hex' | 'ucs2') and TextDecoder('latin1') were
zero-filling their output before overwriting it; add
strings::decode_hex_append, strings::append_latin1_as_utf16_bytes and
strings::cp1252_to_utf16_alloc so those paths write once again, and
spell out on the encoder entry points that string characters and
ArrayBuffer storage never alias.
…f-thread - decode_hex_append and the hex decoders write through MaybeUninit<u8> slots (highway wrappers take MaybeUninit destinations); cp1252_to_utf16_alloc is a plain collect. No &mut [u8]/&mut [u16] is formed over uninitialized memory. - PinnedArrayBuffer refuses shared and resizable buffers and no longer lends a &[u8]: a pool job copies the bytes out under its ticket (to_vec, raw copy), since JS on the owning thread may still store into the buffer. The compression job takes that snapshot on the pool thread. - macOS: vm_deallocate the host_processor_info buffer by its byte length. - zstd: name ZSTD_e_end.
The zlib/brotli/zstd step APIs take a bun_core::ffi::FfiSlice input (gains from_raw/skip/take/copy_to/to_vec), and PinnedArrayBuffer lends the pinned bytes as an FfiSlice under the job's ticket instead of copying them, so an off-thread step reads the ArrayBuffer directly as main did — without ever forming a &[u8] over memory JS may still be writing. Shared and resizable buffers are still copied on the JS thread.
getifaddrs on the BSDs reports netmasks whose own sa_family is AF_UNSPEC and whose sa_len may be short; sizing the copy by the mask's family kept only 16 bytes of an IPv6 mask. Copy size_of the entry's address family (bounded by sa_len on macOS/FreeBSD, zero tail) and tag it with that family, as libuv does.
…ned_utf16_into_js, encode_append_impl
…orage; FfiSlice::copy_to uses memmove; tie JobPinnedArrayBuffer::ffi_slice to the ticket borrow; os.networkInterfaces: alias interfaces take the base interface MAC
…ng: write_u16 doc names every caller behind the non-overlap contract
…m (android default / ENOENT), matching main's shape
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
-
🟡
src/jsc/array_buffer.rs— nit:PinnedArrayBuffer::root_read_onlyis now dead code — its only caller,AsyncInput::newinCompressionStreamCoder.rs, was rewired toJobPinnedArrayBuffer::rootin this PR, and no other repo-wide reference remains. REVIEW.md requires deleting helpers whose last caller you rewired in the same PR. Fix: deleteroot_read_only(copy_if_resizablestill has callers insrc/runtime/node/types.rs, so keep that). [also at: src/simdutf_sys/simdutf.rs:292 - nit:simdutf::base64::encode_rawis now dead — this PR rewires its two callers (bun_base64::encode_appendin…]Extended reasoning...
git grep root_read_onlyafter this change returns only the definition at src/jsc/array_buffer.rs:759. Before the PR,src/runtime/webcore/CompressionStreamCoder.rs'sAsyncInput::newcalledPinnedArrayBuffer::root_read_only(global, chunk); the diff replaces that withJobPinnedArrayBuffer::root(global, chunk)(which callsPinnedArrayBuffer::rootand does its own resizable/shared check).pubitems escape dead-code lints, so the compiler will not flag it. Per REVIEW.md "Delete dead code in the same PR that makes it dead … helpers whose last caller you rewired", this should be removed alongside the caller rewrite.Verification: nit. Base commit d316760 has exactly one caller of
root_read_only—src/runtime/webcore/CompressionStreamCoder.rs:725(if let Some(buf) = PinnedArrayBuffer::root_read_only(global, chunk)). This PR replaces that path withJobPinnedArrayBuffer::root(src/jsc/array_buffer.rs:186-201 in the diff), which callsPinnedArrayBuffer::rootdirectly and does its ownresizable || sharedcheck.…
…w, whose last callers this branch rewired
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What
Same programme as #40055 … #40242.
src/runtime/node/node_os.rs52 → 1,src/runtime/webcore/CompressionStreamCoder.rs44 → 1 (each residual is an all-safe fnunsafe extern "C"block for symbols defined in Bun's own C++),encoding.rs39 → 0,TextEncoder.rs24 → 0,TextDecoder.rs17 → 0,TextEncoderStreamEncoder.rs15 → 0.bun_sys::os(new):InterfaceAddresses::get()/iter()+InterfaceAddress { name, flags, family, address, netmask, link_layer_address }(RAIIfreeifaddrs),passwd_home_dir,loadavg(FreeBSD),ProcessorCpuLoadInfo(macOS,vm_deallocateon drop); WindowsCpuInfoList,InterfaceAddresses,homedir,uname,total_memory,uptime,hostname_w.bun_zlib::{DeflateEncoder, InflateDecoder}::step_into_spare,bun_brotli::{EncoderStream, DecoderStream},bun_zstd::{CompressStream, DecompressStream}— RAII,Send, write only intospare_capacity ∩ out_limitand commit what the codec reports;bun_jsc::PinnedArrayBufferfor the off-thread input.bun_simdutf …::le_append(reserve simdutf's bound, commit on success),bun_base64::{encode_url_safe_append, decode_lenient_append},bun_core::strings::{decode_hex_append, append_latin1_as_utf16_bytes, cp1252_to_utf16_alloc}— theBuffer.from(str, 'hex'|'ucs2'|'base64')paths write into spare capacity with no zero-fill, as before;JSString::visit<V: StringVisitor>;bun_jsc::external_string_utf16(Vec<u16>);encoding::write_u16takes(&[u16], &mut [u8])(source is always JS string characters, never ArrayBuffer storage — the non-overlap contract every other arm on main already assumed is now documented on theBun__encoding__write*declarations). All six files' C exports areHOST_EXPORTs (codegen gains&mut [T]→(T*, len)andSinkHandleparams);CompressionStreamCoder__restoreadded, C++ updated.Pre-existing bugs fixed in passing: macOS
networkInterfaces()MAC lookup indexed the fixed 12-bytesdl_data(wrong MAC for interface names > 6 chars, panic forsdl_nlen > 12); a nullifa_netmaskwas dereferenced (now zero mask, as libuv). Known deltas:TextDecoder's encoding_rs legacy multi-byte path zero-fills its output (cold; no uninit-output API); zlib/brotli stream state now comes from the mimalloc zones.Testing
Debug+ASAN: os.test.js 53/53;
test/js/web/encoding603/603; compression / fetch-compress / fetch-gzip / body / body-stream 9731 pass; zlib.test.js + encoder/decoder streams 750 pass; buffer.test.js 678 pass; node parallel test-os-, test-whatwg-encoding-, test-whatwg-webstreams-compression exit 0. Hand-driven:os.*JSON identical to system bun; gzip/deflate/deflate-raw/brotli/zstd round-trips (empty / 1 B / 10 MB random / 3 MB compressible), truncated/corrupt/trailing-junk errors, TextDecoder split/fatal/shift_jis/latin1/utf16,encodeInto, atob/btoa, TextEncoderStream/TextDecoderStream, HTTP native-sink paths — byte-identical to system bun, no ASAN output. clippy clean on all touched crates;rust-check-allwindows-msvc + apple-darwin pass.