All commands ran from dependency-source/unstd.
No repository source or active extension mutations were made for this review.

Normal isolated build:
env PYTHONPATH=/tmp/unstd-single-root/deps .venv/bin/python /tmp/unstd-single-root/build_gzip.py --root dependency-source/unstd --before /tmp/unstd-single-root/candidate16 --output /tmp/unstd-gzip-encoder-review-20261025a > /tmp/unstd-gzip-encoder-review-20261025a-build.log 2>&1

Focused encoder suite (72 passed in 1.34s):
env PYTHONPATH=/tmp/unstd-gzip-encoder-review-20261025a:/tmp/unstd-single-root/deps .venv/bin/python -m pytest tests/suites/product/compress/unit/test_native_encoder.py -q > /tmp/unstd-gzip-encoder-review-20261025a-tests.log 2>&1

Existing level, timestamp, bytes-like, error and RFC 1952 checks (33 passed in 0.33s):
env PYTHONPATH=/tmp/unstd-gzip-encoder-review-20261025a:/tmp/unstd-single-root/deps .venv/bin/python -m pytest tests/suites/product/compress/unit/test_gzipx.py::test_every_stdlib_level_produces_interoperable_members tests/suites/product/compress/unit/test_gzipx.py::test_one_shot_calls_accept_bytes_like_objects tests/suites/product/compress/unit/test_gzipx.py::test_default_compression_level_matches_stdlib_on_every_surface tests/suites/product/compress/unit/test_gzipx.py::test_omitted_mtime_matches_this_interpreters_stdlib_default tests/suites/product/compress/unit/test_gzipx.py::test_explicit_mtime_has_stdlib_meaning tests/suites/product/compress/unit/test_gzipx.py::test_invalid_compression_levels_preserve_existing_exception_catches tests/suites/product/compress/unit/test_rfc1952_layout.py::test_one_shot_member_frames_match_rfc1952 -q > /tmp/unstd-gzip-encoder-review-20261025a-existing-tests.log 2>&1

Debug allocator boundary corpus (240 passed: 45 C routes and 195 provider fallbacks):
env PYTHONMALLOC=debug PYTHONPATH=/tmp/unstd-gzip-encoder-review-20261025a:/tmp/unstd-single-root/deps .venv/bin/python /tmp/unstd-gzip-encoder-review-20261025a-boundaries.py > /tmp/unstd-gzip-encoder-review-20261025a-boundaries.log 2>&1

Six-case paired benchmark (all eligible; no regressions):
env PYTHONPATH=/tmp/unstd-single-root/deps:dependency-source/unstd .venv/bin/python bench/profiles/consumer_gzip_requests.py run --source /tmp/unstd-gzip-encoder-review-20261025a --baseline-source /tmp/unstd-single-root/candidate16 --fixtures bench/workloads/consumer_gzip_requests.json.gz --codec gzipx --require-native --rounds 9 --batch-ms 20 --output /tmp/unstd-gzip-encoder-review-20261025a-requests.json > /tmp/unstd-gzip-encoder-review-20261025a-requests.log 2>&1

ASan/UBSan isolated build (confirmed __asan and __ubsan symbol references):
env PYTHONPATH=/tmp/unstd-single-root/deps CFLAGS='-fsanitize=address,undefined -fno-omit-frame-pointer -O1' LDFLAGS='-fsanitize=address,undefined' .venv/bin/python /tmp/unstd-single-root/build_gzip.py --root dependency-source/unstd --before /tmp/unstd-single-root/candidate16 --output /tmp/unstd-gzip-encoder-review-20261025a-sanitize > /tmp/unstd-gzip-encoder-review-20261025a-sanitize-build.log 2>&1

ASan/UBSan focused suite (72 passed in 3.19s):
env DYLD_INSERT_LIBRARIES=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/21/lib/darwin/libclang_rt.asan_osx_dynamic.dylib ASAN_OPTIONS=detect_leaks=0 UBSAN_OPTIONS=halt_on_error=1:print_stacktrace=1 PYTHONMALLOC=malloc PYTHONPATH=/tmp/unstd-gzip-encoder-review-20261025a-sanitize:/tmp/unstd-single-root/deps .venv/bin/python -c 'import os, pytest; os.environ["DYLD_INSERT_LIBRARIES"] = "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/21/lib/darwin/libclang_rt.asan_osx_dynamic.dylib"; raise SystemExit(pytest.main(["tests/suites/product/compress/unit/test_native_encoder.py", "-q"]))' > /tmp/unstd-gzip-encoder-review-20261025a-sanitize-tests-retry.log 2>&1

ASan/UBSan boundary corpus (240 passed; no sanitizer finding):
env DYLD_INSERT_LIBRARIES=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/21/lib/darwin/libclang_rt.asan_osx_dynamic.dylib ASAN_OPTIONS=detect_leaks=0 UBSAN_OPTIONS=halt_on_error=1:print_stacktrace=1 PYTHONMALLOC=malloc PYTHONPATH=/tmp/unstd-gzip-encoder-review-20261025a-sanitize:/tmp/unstd-single-root/deps .venv/bin/python /tmp/unstd-gzip-encoder-review-20261025a-boundaries.py > /tmp/unstd-gzip-encoder-review-20261025a-sanitize-boundaries.log 2>&1

Harness notes:
- An initial benchmark omitted the repository root from PYTHONPATH and failed to import bench. The successful command above corrects that.
- An initial sanitized suite passed 70 and failed two subprocess tests because macOS stripped DYLD_INSERT_LIBRARIES after parent startup. Explicitly restoring that environment variable inside the parent fixed those tests; the successful full-suite command is above.
- _testcapi is unavailable in this Python installation, so the optional allocator-failure injection portion of the boundary harness did not run. Existing native failure/no-replay tests still ran in both suites.
