fix(install): shield transaction fidelity and Git-for-Windows ignore seed (#394, #396, #403) - #724
Conversation
…er-raises promise (#394) `_shield_undo_extension`'s `--unset-all` block decodes git's stderr to name why the rollback failed, guarded for `GitError` alone — so on Windows (utf-8/surrogatepass) a lone invalid byte escaped a function contracted never to raise, replacing both the activation fault and the retained-flag disclosure with the caller's generic tail reason. `OSError`/`RuntimeError` stay out: nothing in that block resolves a path. Ablation run: restored the bare `except GitError`, and test_shield_rollback_stderr_decode_fault_is_reported_not_raised errored with the injected UnicodeDecodeError escaping at install.py:1959; restored from a cp backup, re-ran green. Full suite 6699 passed / 49 skipped, pyright 0 errors, trunk check clean.
…icit disable (#396) `_shield_enable_worktree_config` read `extensions.worktreeConfig` with `--type=bool` and treated anything but `true` as "needs enabling", so an operator's explicit `false` / `off` / `no` / `0` in the shared config reported `needs_enable=True`: the SUCCESS path rewrote that declaration to `true` permanently with nothing journaling what it replaced, and a failed activation's `--unset-all` then deleted the operator's own line and reported a clean rollback. Present-but-not-`true` is now a refusal arm beside the `core.bare` / `core.worktree` ones — the shield stands down and the reason quotes the raw spelling it found. Deliberate deviation from the issue's capture/restore sketch (user-approved 2026-08-25): a restore covers only the failure paths, while the success path is where the declaration is lost for good. Accepted cost, stated in the reason and in FEATURES.md: an explicitly-disabled repo gets no shield there. Refusing also puts the rollback deletion out of reach rather than trying to make it faithful. No signatures changed — the probe's 2-tuple, its caller and `_shield_undo_extension` are untouched. MEASURED, identical at both (docker ubuntu:22.04 git 2.34.1, the support floor; and local git 2.55.0): probe rc stdout --type=bool --get on = false/off/no/0/FALSE 0 false --type=bool --get doubled, true then off 0 false (LAST line answers) --type=bool --get doubled, off then true 0 true (LAST line answers) --type=bool --get doubled, junk(1st) then false 128 fatal: bad boolean config value --type=bool --get doubled, false then junk 128 fatal: bad boolean config value --type=bool --get valueless worktreeConfig 0 true (already-carried, NOT refused) raw --get on = off / no / 0 / FALSE 0 off / no / 0 / FALSE raw --get doubled, off then FALSE 0 FALSE (LAST line answers) --type=bool --get absent key 1 (empty) So a doubled disabled flag reaches the refusal, junk in any line degrades at the probe (GitError, caller's tail), a valueless line stays on the already-carried arm, and the raw re-read is what keeps the reason honest — `--type=bool` normalizes every disabled spelling to `false`, which is precisely why the issue's "restore the probed value" sketch could not work. ABLATIONS, run singly and restored from cp backups: - Deleted the `carried is not None` refusal arm: both test_shield_refuses_to_enable_over_an_operator_explicit_false and test_shield_refusal_preserves_a_doubled_disabled_flag FAILED, the enable firing the write booby-trap at install.py:2554, while test_shield_valueless_flag_counts_as_carried_not_refused stayed green — the disjointness that makes the pair mean something. - Replaced the already-carried test with a raw-truthiness read (dropping `--type=bool`): test_shield_valueless_flag_counts_as_carried_not_refused FAILED (the empty stored value reads falsy, so the valueless line is refused as a disable), and both refusal tests FAILED too (a truthy `off` reads as already-carried) — that reading is wrong in both directions at once. Full suite 6702 passed / 49 skipped, pyright 0 errors, trunk check clean.
…403) `_shield_home_git_ignore` asked git where its `$HOME` is and stopped there. That is the whole of git's ignore fallback upstream, but not on the Git for Windows fork from 2.46 onward: the fork patches `xdg_config_home_for` (`path.c`) to prefer `%APPDATA%/Git/<file>` whenever that file exists, and warns that it ignored the `$HOME` one when both are present. They are alternative locations, not a search path. The harm ran in both directions, and both were silent: - APPDATA file only — the returned `$HOME` path is typically not a file, so the seed came back empty with `reason is None` and the caller still activated a worktree-scoped `core.excludesFile` shadowing the file git really reads. Everything the operator globally ignores became visible to `git add -A` and was swept into the story commit. - Both files present — git reads APPDATA while the shield seeded `$HOME`, copying patterns git is not applying. The worktree over-ignored and session-created files went silently missing. Gated on the FORK STRING, not on `sys.platform` (deviation from #403's sketch, user-approved 2026-08-25). The preference is one fork's patch, not a property of the OS: Cygwin, MSYS2 and WSL gits run on Windows hardware as upstream builds and a `win32` test would hand every one of them the wrong file. install.py carries no `sys.platform` branch anywhere else, and asking git what it is keeps the tests honest — they fake a version string, never a platform, so they exercise the real path on a POSIX box. `is_file()` mirrors the fork's own `file_exists` precondition and is load-bearing; check order is cheap-first (env -> stat -> one extra spawn only when the candidate exists); every non-matching outcome, `git version` rc != 0 included, falls through to the `$HOME` probe, which is the pre-fix behavior and which raises its own GitError on a git that is truly dead. PROVENANCE: source-read of `git-for-windows/git` and `git/git` through #403, version bounds counted per tag (present 2.46.0.windows.1 and 2.55.0.windows.3, absent 2.45.0.windows.1 and 2.20.0.windows.1, absent upstream). NOT measured on a Windows machine — none was available, and Windows CI could not supply one either since its runners carry no `%APPDATA%\Git\ignore`. The tests pin our selection logic; they do not claim the fork agrees. Ablations, each run singly and restored from a post-edit `cp` snapshot with the md5 re-verified: - whole APPDATA arm deleted -> `test_shield_prefers_appdata_ignore_on_the_windows_fork` red (`appdata-junk.tmp` missing, `home-junk.tmp` seeded); the other three stay green, since pre-fix behavior is what they assert. - `git_version_at_least` conjunct deleted -> `test_shield_appdata_ignore_needs_the_246_fork` red at 2.45.0.windows.1 (APPDATA seeded off a fork without the patch). - `".windows." in reported` conjunct deleted -> `test_shield_appdata_ignore_is_the_forks_not_the_platforms` red at upstream 2.55.0. - `is_file()` precondition dropped -> `test_shield_appdata_absent_file_keeps_the_home_fallback` red with the seed reduced to the shield's own `/probe-403` pattern, i.e. EMPTY — #403's silent harm exactly. Also adds a `git version 2.46.0.windows.1` row to test_verify's floor-predicate table, pinning that `git_version_at_least`'s lookahead accepts the four-component fork spelling this gate depends on.
The shield bullet already carried #396's explicit-disable refusal among the skip conditions; it still described git's XDG ignore fallback as if the `$HOME` answer were the whole of it. Phase 3 changed that: on the Git for Windows fork >= 2.46 the seeded file is `%APPDATA%/Git/ignore` whenever it exists. Written to match what the code actually does — the harm named in BOTH directions (an empty seed that shadows the file git really reads; patterns git is not applying that make session files go missing), the gate stated as the reported version's own `.windows.` fork string rather than the platform, the fall-through for every other outcome including an unanswerable `git version`, and the provenance kept honest: source-read from the fork, not measured on a Windows machine. Documentation only; no behavior change.
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. WalkthroughThe git-add shield now preserves explicit ChangesGit-add shield safeguards
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The installer’s Git-for-Windows ignore-file selection can still fall back to HOME patterns when an existing APPDATA candidate is not a regular file, so the shield may seed patterns Git does not use and alter which files are included or excluded. This bounded correctness risk remains unresolved at the current head and should be fixed or explicitly accepted before merge. Suggested reviewers: Poem
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In `@src/bmad_loop/install.py`:
- Around line 2077-2088: Update the candidate selection around
candidate.is_file() to match Git’s lstat-based existence predicate, allowing an
existing non-regular APPDATA path to be recognized as selected. When the
selected APPDATA path is a directory or other non-regular entry, raise GitError
instead of falling back to the HOME path; add a regression test covering a
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CHANGELOG.mddocs/FEATURES.mdsrc/bmad_loop/install.pytests/test_install.pytests/test_verify.py
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…TA ignore (#403) The APPDATA arm gated on `Path.is_file()` while claiming in its comment to mirror the fork's `file_exists` precondition. It does not: `xdg_config_home_for` gates on `file_exists(appdata_config)` (`path.c`), and `file_exists` is `lstat(f, &sb) == 0` (`dir.c`) — so a DIRECTORY and a BROKEN SYMLINK satisfy git's test and are selected as `excludes_file`, while `is_file()` rejects both. Rejecting what the fork accepts is not a safe fall-through: it sends the shield to the `$HOME` file git is NOT reading, seeding patterns git does not apply — #403's over-ignore direction, the one that makes session-created files go missing. `_shield_file_exists` now spells git's predicate literally. A non-regular candidate still seeds nothing, and that empty seed is the faithful answer rather than an accident of the caller: git gets no usable patterns from either shape. Traced through the fork's consumption path — a broken symlink is dropped by `access_or_warn(..., R_OK)`, whose ENOENT counts as an ignorable missing file, and a directory reaches `add_patterns_from_file_1`'s `die("cannot use %s as an exclude file")`. The caller's own `is_file()` at the seed read already produces exactly that empty seed, so no new refusal was warranted; raising here would skip the shield over an answer that is knowable. Source-read at v2.46.0.windows.1 and v2.55.0.windows.3 (both identical), absent at v2.45.0.windows.1. Still NOT measured on Windows, as the sibling record states. ABLATIONS, run singly and restored from a post-edit cp snapshot with the md5 re-verified after each restore: - `_shield_file_exists` narrowed back to `candidate.is_file()` -> test_shield_appdata_ignore_directory_is_selected_like_gits_lstat red (the arm rejects the directory, falls through, `home-junk.tmp` seeded); the other four stay GREEN, since pre-fix-compatible behavior is what they assert. - the precondition dropped entirely -> test_shield_appdata_absent_file_keeps_the_home_fallback red with the seed reduced to `/probe-403` alone, i.e. EMPTY. This re-runs a record the rename would otherwise have left stale, its docstring having named `is_file()`. Full suite 6708 passed / 49 skipped, pyright 0 errors, trunk fmt + trunk check --all clean. Raised by CodeRabbit on #724; its diagnosis held, its suggested `GitError` did not.
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| A non-regular candidate still seeds NOTHING, because the caller applies its own | ||
| `is_file()` before reading it, and that empty seed is the faithful answer: git | ||
| applies no patterns from either shape. A broken symlink is dropped by git's own | ||
| `access_or_warn(..., R_OK)` gate, whose `ENOENT` counts as an ignorable missing | ||
| file; a directory makes git `die("cannot use %s as an exclude file")` instead, so | ||
| there are no patterns to mirror in either case. |
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When Git for Windows ≥2.46 finds a directory at %APPDATA%\Git\ignore, this helper deliberately treats it as present, but _shield_inherited_excludes subsequently treats it as an empty seed because source.is_file() is false. As the adjacent comment acknowledges, Git itself aborts when the exclude path is a directory; activating the valid worktree-scoped exclude therefore masks that configuration error and lets the session's git add -A proceed with no inherited patterns, potentially staging files where the unshielded command would have halted. This shape should degrade/refuse instead of being modeled as an empty exclude file.
AGENTS.md reference: AGENTS.md:L81-L81
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Fixed in ac31ca8 — you were right, and this was the one thing the previous round got
wrong.
Confirmed: the two non-regular shapes are not equivalent, and I had treated them as if
they were. Tracing the fork's read path rather than just its selection:
- Broken symlink —
access(R_OK)follows the link to a missing target,ENOENT,
whichaccess_error_is_okclassifies as an ignorable missing file. Git loads no
patterns and runs on. An empty seed mirrors that exactly. - Directory —
access(R_OK)succeeds on a readable directory, so git reaches
add_patterns_from_file_1anddie("cannot use %s as an exclude file"). Git does
not run at all.
So an empty seed for the directory renders a fatal as a permissive success, and your
point about the activation is what makes it bite: the worktree-scoped
core.excludesFile shadows the broken path, so the unit's git add -A proceeds inside
the worktree while the operator's own git refuses to run — the misconfiguration masked
rather than surfaced.
A selected-but-unusable path is UNKNOWN, not empty, so it now takes the same reading this
module already gives an unresolvable $HOME: raise, and let the caller degrade with a
journaled reason naming the path.
One deliberate narrowing of your suggestion. The refusal is is_dir(), not "any
non-regular candidate" — refusing a broken symlink would stand the shield down over a
configuration git itself handles silently and successfully. is_dir() follows the link
on purpose, since a symlink to a directory is the same fatal.
Both directions are pinned by ablations, run singly from a post-edit snapshot, and they
redden disjoint tests:
- refusal removed → the directory test reds with
reason is None(the masked-fatal shape) - refusal widened to
not is_file()→ the broken-symlink test reds, degrading over a
healthy repo
Full suite 6709 passed / 49 skipped, pyright 0, trunk check --all clean.
…ding it empty (#403) The previous commit made the APPDATA arm select on git's own `lstat` predicate and let the caller's `is_file()` turn any non-regular candidate into an empty inherited seed. That is the faithful mirror for ONE of the two shapes and the wrong answer for the other. Traced through the fork's read path, they diverge: - BROKEN SYMLINK — `access(R_OK)` follows the link to a missing target, `ENOENT`, which `access_error_is_ok` classifies as an ignorable missing file. Git prints nothing, loads no patterns, and runs on. An empty seed mirrors that exactly. - DIRECTORY — `access(R_OK)` succeeds on a readable directory, so git goes on to `add_patterns_from_file_1` and dies: "cannot use %s as an exclude file". Git does not run at all. Modelling the second as an empty seed renders a FATAL as a permissive success. The shield's activation writes a worktree-scoped `core.excludesFile` that SHADOWS the broken path, so the unit's `git add -A` would run happily inside the worktree while the operator's own git refuses to run at all — the misconfiguration masked, and files staged where the unshielded command would have halted. A selected-but-unusable path is UNKNOWN, not empty, so it takes the reading this module already gives an unresolvable `$HOME`: raise, and let the caller degrade with a journaled reason naming the path. `is_dir()` follows the link deliberately — a symlink to a directory is the same fatal — while a broken one is not a directory and still seeds empty. Deliberately NOT a refusal of every non-regular shape: that would stand the shield down over a broken symlink git itself is perfectly happy with. Ablation B below pins that. ABLATIONS, run singly and restored from a post-edit cp snapshot with the md5 re-verified after each restore. They redden DISJOINT tests, which is what makes them proof: - `is_dir()` refusal removed -> test_shield_appdata_ignore_directory_degrades_instead_of_seeding_empty red with `reason is None` — the masked-fatal shape exactly. - refusal widened to `not candidate.is_file()` -> test_shield_appdata_ignore_broken_symlink_seeds_empty_not_a_refusal red, the shield degrading over a repo whose git runs fine. Test helpers now take an explicit `appdata_shape` (file / absent / directory / broken-symlink) and `_drive_shield` returns the degrade reason alongside the lines, since two of the four shapes are no longer seed-and-assert. The symlink test is POSIX-only, per the house `skipif(os.name == "nt")`. Full suite 6709 passed / 49 skipped, pyright 0 errors, trunk fmt + trunk check --all clean. Raised by Codex on #724. Source-read at v2.46.0.windows.1 / v2.55.0.windows.3; still not measured on Windows, as the sibling record states.
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Three fixes to the worktree git-add shield in
src/bmad_loop/install.py, one per commit.They share a theme: the shield's transaction — probe, enable, activate, roll back — has to
tell the truth about what it found and what it changed, and it has to keep the promises its
own docstrings make.
_shield_undo_extensioncan raise through its own stderr decode (#394)Mechanism. The rollback's
--unset-allblock decodes git's stderr to name why therollback failed. That decode was guarded for
GitErroralone, andos.fsdecodeon Windowsuses utf-8/surrogatepass, which rejects a lone invalid byte. So a codec fault escaped a
function contracted never to raise — taking the activation fault and the retained-flag
disclosure with it, and leaving the caller's generic tail reason in their place. POSIX
decodes with surrogateescape and never raises, which is why this is Windows-only.
The
exceptwidens to(GitError, UnicodeError).OSError/RuntimeErrorstay out:nothing in that block resolves a path, which is what those two are there for in the sibling
dependents-scan tuple above it. The stale pointer comment at the caller was rewritten.
Evidence. The fault is injected rather than reasoned about —
test_shield_rollback_stderr_decode_fault_is_reported_not_raiseddrives a real rollback withan
os.fsdecodepredicate-scoped to the marker bytes, so the decode under test faults andnothing else does.
Ablation (run). Restoring the bare
except GitErrormakes that test error, with theinjected
UnicodeDecodeErrorescaping at thefsdecodecall. Restored from acpbackup,green again.
The shield enables
extensions.worktreeConfigover an operator's explicit disable (#396)Mechanism.
_shield_enable_worktree_configread the flag with--type=booland treatedanything but
trueas "needs enabling". An operator's explicitfalse/off/no/0in the shared config therefore reported
needs_enable=True, and that ran two ways:true, permanently, with nothingjournaling what it replaced;
--unset-allthen deleted the operator's ownline and reported a clean rollback.
Present-but-not-
trueis now a refusal arm, sitting beside the existingcore.bareandcore.worktreeones: the shield stands down and the reason quotes the raw spelling it found.No signatures changed — the probe's 2-tuple, its caller and
_shield_undo_extensionareuntouched, and #396's rollback deletion becomes unreachable rather than being made faithful.
Planned deviation from the issue's sketch — refusal, not capture/restore
(user-approved 2026-08-25). The issue sketched capturing the probed value and restoring it on
rollback. Design review found that covers only the failure paths, while the success
path is where the operator's declaration is lost for good and unjournaled — the same
operator-config-overwrite class the rollback was being asked to fix. Two further facts made
the sketch unimplementable as written:
--type=boolnormalizes every disabled spelling(
off/no/0/FALSEall read backfalse), so "restore the probed value" would restore aspelling the operator never wrote; and refusing parallels the module's stated "no repo-layout
edits behind an operator's back" discipline. Accepted cost, stated in the reason and in
docs/FEATURES.md: a repo carrying an explicit disable gets no shield there.Measured evidence. Identical at the support floor (
docker run --rm ubuntu:22.04, git2.34.1) and current local git 2.55.0:
--type=bool --get, valuefalse/off/no/0/FALSEfalse--type=bool --get, doubledtruethenofffalse(LAST line answers)--type=bool --get, doubledoffthentruetrue(LAST line answers)--type=bool --get, junk in either linefatal: bad boolean config value--type=bool --get, valuelessworktreeConfigtrue(already-carried, NOT refused)--get, valueoff/no/0/FALSEoff/no/0/FALSE--type=bool --get, absent keySo a doubled disabled flag reaches the refusal, junk anywhere degrades at the probe, a
valueless line stays on the already-carried arm, and the raw re-read is what keeps the
reason honest.
Ablations (run, singly, restored from
cpbackups).booby-trap, while
test_shield_valueless_flag_counts_as_carried_not_refusedstaysgreen. That disjointness is what makes the pair mean something.
--type=bool) → all three fail:a valueless line gets refused as a disable and a stored
offreads as already-carried.Wrong in both directions at once.
The shield seeds the wrong global ignore file on Git for Windows ≥ 2.46 (#403)
Mechanism.
_shield_home_git_ignoreasked git where its$HOMEis and stopped there.That is the whole of git's ignore fallback upstream, but not on the Git for Windows fork
from 2.46 on: the fork patches
xdg_config_home_for(path.c) to prefer%APPDATA%/Git/<file>whenever that file exists, and warns that it ignored the$HOMEonewhen both are present. They are alternative locations, not a search path.
The harm ran in both directions, both silent:
$HOMEpath is typically not a file, so the seed cameback empty with
reason is Noneand the caller still activated a worktree-scopedcore.excludesFileshadowing the file git really reads. Everything the operatorglobally ignores became visible to
git add -Aand was swept into the story commit.$HOME, copyingpatterns git is not applying. The worktree over-ignored and session-created files went
silently missing.
A new
_APPDATA_IGNORE_GIT = (2, 46)gates an arm ordered cheap-first: envAPPDATA→ thecandidate's
is_file()→ one extragit versionspawn only when that candidate exists.Every non-matching outcome, a non-zero
git versionrc included, falls through to theunchanged
$HOMEprobe — which is the pre-fix behavior, and a git too dead to report itsversion still raises its own
GitErrorthere.Planned deviation from the issue's sketch — fork string, not
sys.platform(user-approved 2026-08-25). The preference is a patch carried by one fork, not a property
of the OS: Cygwin, MSYS2 and WSL gits run on Windows hardware as upstream builds, and a
win32test would hand every one of them the wrong file.install.pycarries nosys.platformbranch anywhere else. And asking git what it is keeps the tests honest — theyfake a version string, never a platform, so they exercise the real code path on a POSIX box.
is_file()is load-bearing: it mirrors the fork's ownfile_existsprecondition, and it iswhat keeps the cost at one stat on every other platform.
Evidence, and its limits. Source-read of
git-for-windows/gitandgit/gitthrough #403,with the version bounds counted per tag: the patch is present at
2.46.0.windows.1and2.55.0.windows.3, absent at2.45.0.windows.1and2.20.0.windows.1, and absent fromupstream
git/gitentirely. NOT measured on a Windows machine — none was available, andWindows CI cannot supply one either, since its runners carry no
%APPDATA%\Git\ignoreand socan show only that nothing broke. The tests pin our selection logic; they do not claim the
fork agrees.
The non-regular shapes, added under review. git's precondition is
file_exists, andthat is
lstat(f, &sb) == 0(dir.c) — so a directory and a broken symlink satisfy it andthe fork selects them exactly as it selects a file.
_shield_file_existsspells thatpredicate literally rather than using
Path.is_file(), which would reject what git acceptsand fall through to the
$HOMEfile git is not reading. Selecting is not mirroring, though,and the two shapes then part company: a broken symlink is dropped by git's own
access_or_warn(..., R_OK)gate, whoseENOENTcounts as an ignorable missing file, so gitloads no patterns and runs on — an empty inherited seed mirrors that exactly. A directory
passes the same gate and reaches
add_patterns_from_file_1, where git dies. An empty seedthere would render a fatal as a permissive success, and the shield's own activation would
mask it: the worktree-scoped
core.excludesFileshadows the broken path, so the unit'sgit add -Awould run happily where the operator's git refuses to run at all. That shaperaises instead, and the caller degrades with a journaled reason naming the path — the same
reading this module already gives an unresolvable
$HOME.Ablations (run, singly, restored from a post-edit
cpsnapshot with the md5 re-verified).test_shield_prefers_appdata_ignore_on_the_windows_forkred; the other three stay green, since pre-fix behavior is what they assertgit_version_at_leastconjunct deletedtest_shield_appdata_ignore_needs_the_246_forkred at2.45.0.windows.1".windows." in reportedconjunct deletedtest_shield_appdata_ignore_is_the_forks_not_the_platformsred at upstream2.55.0test_shield_appdata_absent_file_keeps_the_home_fallbackred with the seed reduced to the shield's own pattern, i.e. empty — #403's silent harm exactly_shield_file_existsnarrowed tois_file()test_shield_appdata_ignore_directory_degrades_instead_of_seeding_emptyredis_dir()refusal removedreason is None— the masked-fatal shapetest_shield_appdata_ignore_broken_symlink_seeds_empty_not_a_refusalred, degrading over a repo whose git runs fineEach of the four tests asserts both a pattern that must be seeded and one that must
not, so a system-level
core.excludesFilehijacking the branch reddens loudly instead ofpassing vacuously. A
git version 2.46.0.windows.1row was added totest_verify'sfloor-predicate table, pinning that
git_version_at_leastaccepts the four-component forkspelling this gate depends on.
Testing
uv run pytest -q -n logical— 6709 passed, 49 skipped, 10 new tests across the fivecommits plus one new
test_verifyparametrized row.uv run pyright— 0 errors, 0 warnings, 0 informations.trunk fmtclean;trunk check --allclean (whole-repo, not just changed files).cpbackup, never agit checkout, and each is recorded in its test's docstring and its commit message.Scope
Documentation and
CHANGELOG.mdupdated alongside: thedocs/FEATURES.mdshield bullet nowcarries the #396 refusal among the skip conditions and describes the #403 APPDATA seed with
its provenance caveat intact, and
## [Unreleased] → ### Fixedcarries one line per issue.No new policy fields, env vars or check ids; no CLI syntax,
--jsonor exit-code changes.#402 stays open; its git-floor scope shipped in 0.11.1 via #692.
A fourth issue, #723, was filed from the same reading and is deliberately not in this PR:
a pre-existing wording overclaim in the rollback's sibling-scan decline, outside all three
issues' scope.
Closes #394
Closes #396
Closes #403