perf: batch unchanged spans in sensitive-log redaction - #791
Conversation
Replaced character-by-character list appending simulating string slicing inside `_redact_assignments` with native batched string slicing using `last_append`. This resolves an O(N^2) memory copying bottleneck in log scrubbing on large files.
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@coderabbitai review Read-only independent review request for exact current head Verify that |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
head_sha='201408d9232309bda999a82172d703f8e97258e9'
base_sha='f070c504c1cb06891b800d7ab0cf6ac7d3cf8eae'
repo='ContextualWisdomLab/.github'
pr='791'
echo '== Checked-out commit =='
git rev-parse HEAD
echo '== Commit availability =='
git cat-file -t "$head_sha"
git cat-file -t "$base_sha"
echo '== Exact diff summary =='
git diff --stat "$base_sha" "$head_sha"
echo '== Exact diff =='
git diff --find-renames --find-copies "$base_sha" "$head_sha" --
echo '== Candidate implementation and test files =='
fd -t f . | rg '(^|/).*(redact|sensitive|log).*\.py$|(^|/)test.*\.py$' || true
echo '== _redact_assignments definitions and uses =='
rg -n -C 8 --glob '*.py' '\b_redact_assignments\s*\(' . || true
echo '== Pull request metadata and exact-head status =='
gh pr view "$pr" --repo "$repo" --json number,headRefOid,baseRefOid,reviewDecision,mergeStateStatus,statusCheckRollup,reviews \
--jq '{
number,
headRefOid,
baseRefOid,
reviewDecision,
mergeStateStatus,
checks: [.statusCheckRollup[] | {name, status, conclusion, detailsUrl}],
reviews: [.reviews[] | {author: .author.login, state, commit: .commit.oid}]
}'
echo '== Exact-head check runs =='
gh api "repos/$repo/commits/$head_sha/check-runs?per_page=100" \
--jq '.check_runs[] | {name, status, conclusion, details_url, head_sha}'
echo '== Exact-head reviews =='
gh api "repos/$repo/pulls/$pr/reviews?per_page=100" \
--jq '.[] | {user: .user.login, state, commit_id, submitted_at}'
echo '== Open review threads =='
gh api graphql -F owner='ContextualWisdomLab' -F name='.github' -F number="$pr" -f query='
query($owner: String!, $name: String!, $number: Int!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $number) {
reviewThreads(first: 100) {
nodes { isResolved comments(first: 1) { nodes { author { login } body } } }
}
}
}
}' --jq '[.data.repository.pullRequest.reviewThreads.nodes[] | select(.isResolved == false)]'Length of output: 28028 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '== Source structure =='
ast-grep outline scripts/ci/redact_sensitive_log.py --items all --view expanded
echo '== Redaction parser and caller =='
sed -n '1,165p' scripts/ci/redact_sensitive_log.py
echo '== Security-boundary test references =='
rg -n -C 12 --glob '*.py' \
'redact_sensitive_log|_redact_assignments|_redact_unstructured|REDACTED|sensitive.*log|secret.*redact' \
tests scripts || true
echo '== Exact changed-file history and PR text =='
git diff --check f070c504c1cb06891b800d7ab0cf6ac7d3cf8eae 201408d9232309bda999a82172d703f8e97258e9
git log --format='%H%n%s%n%b%n---' \
f070c504c1cb06891b800d7ab0cf6ac7d3cf8eae..201408d9232309bda999a82172d703f8e97258e9 -- \
scripts/ci/redact_sensitive_log.py
gh pr view 791 --repo ContextualWisdomLab/.github --json title,body,commits \
--jq '{title, body, commits: [.commits[] | {oid: .oid, messageHeadline: .messageHeadline, messageBody: .messageBody}]}'Length of output: 35804
I found no code-level blocker.
The existing security-boundary assertions remain unchanged. They cover JSON credentials, assignment parsing edges, escaped quoted values, provider-token shapes, normal diagnostics, and line boundaries. The current PR description correctly describes a constant-factor reduction in Python-level The named exact-head security and policy checks are successful. There are zero unresolved review threads. I cannot approve yet because You are interacting with an AI system. |
Acknowledged. The |
Replaced character-by-character list appending simulating string slicing inside `_redact_assignments` with native batched string slicing using `last_append`. This resolves an O(N^2) memory copying bottleneck in log scrubbing on large files.
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@opencode-agent @cwl-noema-review Please review exact head |
Replaced character-by-character list appending simulating string slicing inside `_redact_assignments` with native batched string slicing using `last_append`. This resolves an O(N^2) memory copying bottleneck in log scrubbing on large files.
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@opencode-agent @cwl-noema-review Review exact head Run current-head sensitive-log security regressions, production statement/branch coverage, public docstrings, and adversarial assignment cases including no match, adjacent matches, prefix/suffix text, mixed-case keys, delimiters, malformed assignments, and long unmatched spans. Submit a formal exact-head verdict only; independent non-author approval and branch protection remain mandatory. |
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Exact-current-head review request for @opencode-agent |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
repo='ContextualWisdomLab/.github'
pr='791'
head_sha='46c3b063cf6850d7157c0dc9c21310a660447e76'
base_sha='f070c504c1cb06891b800d7ab0cf6ac7d3cf8eae'
echo '== Exact commit identity =='
printf 'checked_out='; git rev-parse HEAD
git cat-file -e "${head_sha}^{commit}"
git cat-file -e "${base_sha}^{commit}"
echo '== Exact changed files and diff =='
git diff --name-status "${base_sha}" "${head_sha}"
git diff --check "${base_sha}" "${head_sha}"
git diff --find-renames --find-copies "${base_sha}" "${head_sha}" --
echo '== Parser structure =='
ast-grep outline scripts/ci/redact_sensitive_log.py --items all --view expanded
echo '== Relevant source =='
sed -n '1,240p' scripts/ci/redact_sensitive_log.py
echo '== Relevant Python test references =='
rg -n -C 10 --glob '*.py' \
'\b_redact_assignments\s*\(|\bredact_sensitive_log\b|REDACTED|sensitive assignment|sensitive.*log' \
. || true
echo '== Pull request metadata =='
gh pr view "$pr" --repo "$repo" \
--json headRefOid,baseRefOid,reviewDecision,mergeStateStatus,statusCheckRollup,reviews \
--jq '{
headRefOid, baseRefOid, reviewDecision, mergeStateStatus,
checks: [.statusCheckRollup[] | {name, status, conclusion, detailsUrl}],
reviews: [.reviews[] | {author: .author.login, state, commit: .commit.oid}]
}'
echo '== Exact-head check runs =='
gh api "repos/${repo}/commits/${head_sha}/check-runs?per_page=100" \
--jq '.check_runs[] | {name, status, conclusion, details_url, head_sha}'
echo '== Exact-head reviews =='
gh api "repos/${repo}/pulls/${pr}/reviews?per_page=100" \
--jq '.[] | {user: .user.login, state, commit_id, submitted_at}'
echo '== Unresolved review threads =='
gh api graphql -F owner='ContextualWisdomLab' -F name='.github' -F number="$pr" -f query='
query($owner: String!, $name: String!, $number: Int!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $number) {
reviewThreads(first: 100) {
nodes {
isResolved
comments(first: 1) { nodes { author { login } body } }
}
}
}
}
}' --jq '[.data.repository.pullRequest.reviewThreads.nodes[] | select(.isResolved == false)]'Length of output: 52038
I found no code-level finding in the one-file diff.
The existing security-boundary tests cover JSON credentials, normal diagnostics, escaped quoted values, assignment parser edge cases, provider-token shapes, empty input, and line boundaries. The exact-head CI evidence shows the listed security and policy checks as successful or neutral. The implementation is a constant-factor improvement. It reduces per-character I cannot submit an approval for this exact head.
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@coderabbitai review Please review exact current head |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
repo='ContextualWisdomLab/.github'
pr='791'
head_sha='46c3b063cf6850d7157c0dc9c21310a660447e76'
base_sha='f070c504c1cb06891b800d7ab0cf6ac7d3cf8eae'
echo '== Commit identity =='
printf 'checked_out='
git rev-parse HEAD
git cat-file -t "$head_sha"
git cat-file -t "$base_sha"
echo '== Exact diff files and whitespace check =='
git diff --name-status "$base_sha" "$head_sha"
git diff --check "$base_sha" "$head_sha"
git diff --find-renames --find-copies "$base_sha" "$head_sha" --
echo '== Redactor structure =='
ast-grep outline scripts/ci/redact_sensitive_log.py --items all --view expanded
echo '== Redactor source =='
sed -n '1,260p' scripts/ci/redact_sensitive_log.py
echo '== Relevant test files and test references =='
fd -t f -e py . | rg '(^|/)(test|.*test.*|.*redact.*|.*sensitive.*)\.py$' || true
rg -n -C 12 --glob '*.py' \
'\b_redact_assignments\s*\(|\bredact_sensitive_log\b|REDACTED|escaped quoted|assignment parser|sensitive assignment|provider.token' \
. || true
echo '== Exact-head pull request metadata =='
gh pr view "$pr" --repo "$repo" \
--json headRefOid,baseRefOid,reviewDecision,mergeStateStatus,statusCheckRollup,reviews \
--jq '{
headRefOid, baseRefOid, reviewDecision, mergeStateStatus,
checks: [.statusCheckRollup[] | {name, status, conclusion, detailsUrl}],
reviews: [.reviews[] | {author: .author.login, state, commit: .commit.oid}]
}'
echo '== Exact-head check runs =='
gh api "repos/$repo/commits/$head_sha/check-runs?per_page=100" \
--jq '.check_runs[] | {name, status, conclusion, details_url, head_sha}'
echo '== Exact-head formal reviews =='
gh api "repos/$repo/pulls/$pr/reviews?per_page=100" \
--jq '.[] | {user: .user.login, state, commit_id, submitted_at}'
echo '== Unresolved review threads =='
gh api graphql -F owner='ContextualWisdomLab' -F name='.github' -F number="$pr" -f query='
query($owner: String!, $name: String!, $number: Int!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $number) {
reviewThreads(first: 100) {
nodes {
isResolved
comments(first: 1) { nodes { author { login } body } }
}
}
}
}
}' --jq '[.data.repository.pullRequest.reviewThreads.nodes[] | select(.isResolved == false)]'Length of output: 56695
I found no code-level blocker. The diff changes only
This behavior preserves no-match input, adjacent assignments, prefix and suffix text, delimiters, mixed-case sensitive keys, malformed assignments, quoted values with escapes, and Unicode text. The security-boundary tests cover JSON credentials, regular diagnostics, quoted escaped values, assignment-parser edge cases, provider token shapes, empty input, line boundaries, and CLI use. I did not execute repository code in this sandbox. The exact-head CI records show the completed security, policy, and coverage checks as successful or neutral. The implementation is a constant-factor improvement. It reduces Python-level I cannot submit approval for this exact head. You are interacting with an AI system. |
There was a problem hiding this comment.
Pull request overview
OpenCode could not approve from deterministic current-head evidence because GitHub Checks have failed.
Findings
1. HIGH Current-head GitHub Checks - Fix failed required checks before approval
- Problem: Failed same-head checks remain for
46c3b063cf6850d7157c0dc9c21310a660447e76. - Root cause: The model-unavailable evidence fallback is allowed only when peer GitHub Checks are complete and clean.
- Fix: Read and fix the failed check logs below, then rerun the current-head checks.
- Regression test: Keep the model-unavailable fallback gated on an empty failed-check rollup.
Failed checks:
Changed-File Evidence Map
flowchart LR
PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
Evidence --> S1["CI script: redact_sensitive_log.py"]
S1 --> I1["review and security gate shell path"]
I1 --> R1["Review risk: CI script: redact_sensitive_log.py"]
R1 --> V1["bash -n plus Strix self-test"]
OpenCode Review Overview
Changed-File Evidence Mapflowchart LR
PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
Evidence --> S1["CI script: redact_sensitive_log.py"]
S1 --> I1["review and security gate shell path"]
I1 --> R1["Review risk: CI script: redact_sensitive_log.py"]
R1 --> V1["bash -n plus Strix self-test"]
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The review's sole blocker was the Strix run state. The exact-head Strix workflow run 31071120319 now has a successful strix job and successful same-head status publication. The implementation head is unchanged; this failure-only verdict is stale and must not continue blocking a fresh exact-head review.
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@opencode-agent @cwl-noema-review @coderabbitai review Review-only request for exact current head |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
repo='ContextualWisdomLab/.github'
pr='791'
head_sha='46c3b063cf6850d7157c0dc9c21310a660447e76'
base_sha='f070c504c1cb06891b800d7ab0cf6ac7d3cf8eae'
echo '== Exact commit identity =='
printf 'checked_out='
git rev-parse HEAD
git cat-file -t "$head_sha"
git cat-file -t "$base_sha"
echo '== Exact changed files and diff =='
git diff --name-status "$base_sha" "$head_sha"
git diff --check "$base_sha" "$head_sha"
git diff --find-renames --find-copies "$base_sha" "$head_sha" --
echo '== Redactor structure and implementation =='
ast-grep outline scripts/ci/redact_sensitive_log.py --items all --view expanded
sed -n '1,280p' scripts/ci/redact_sensitive_log.py
echo '== Sensitive-log test definitions and assertions =='
rg -n -C 10 --glob '*.py' \
'\b_redact_assignments\s*\(|\bredact_sensitive_log\b|REDACTED|sensitive assignment|escaped quoted|provider.token' \
. || true
echo '== Exact-head PR status and formal reviews =='
gh pr view "$pr" --repo "$repo" \
--json headRefOid,baseRefOid,reviewDecision,mergeStateStatus,statusCheckRollup,reviews \
--jq '{
headRefOid, baseRefOid, reviewDecision, mergeStateStatus,
checks: [.statusCheckRollup[] | {name, status, conclusion, detailsUrl}],
reviews: [.reviews[] | {author: .author.login, state, commit: .commit.oid}]
}'
echo '== Exact-head check runs =='
gh api "repos/$repo/commits/$head_sha/check-runs?per_page=100" \
--jq '.check_runs[] | {name, status, conclusion, details_url, head_sha}'
echo '== Unresolved review threads =='
gh api graphql -F owner='ContextualWisdomLab' -F name='.github' -F number="$pr" -f query='
query($owner: String!, $name: String!, $number: Int!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $number) {
reviewThreads(first: 100) {
nodes {
isResolved
comments(first: 1) { nodes { author { login } body } }
}
}
}
}
}' --jq '[.data.repository.pullRequest.reviewThreads.nodes[] | select(.isResolved == false)]'Length of output: 53582
I found no code-level blocker. The diff changes only
The security-boundary tests remain in place. They cover JSON credentials, ordinary diagnostics, escaped quoted values, assignment-parser edge cases, provider-token forms, empty input, line boundaries, and CLI behavior. I did not execute repository Python in this sandbox. The exact-head CI records show the listed security, policy, coverage, The optimization is realistic but constant-factor only. It reduces Python-level GitHub shows zero unresolved review threads. GitHub still reports
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Review-only request for exact current head |
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@cwl-noema-review Independently review exact current head |
There was a problem hiding this comment.
Pull request overview
OpenCode reviewed the current-head bounded evidence and found no blocking issues.
Findings
No blocking findings.
Summary
Approval sufficiency: APPROVE for scripts/ci/redact_sensitive_log.py — batching unchanged spans with the last_append window is byte-identical to the base per-char loop (unchanged spans flushed via text[last_append:cursor] before each replacement and a trailing text[last_append:]; replacement spans and cursor advancement untouched). Verification posture: Failed GitHub Check evidence reports no completed failed checks at head 46c3b06; mergeStateStatus blocked is branch policy, not DIRTY/CONFLICTING. Linter/static: no current-head linter/static failures surfaced; PR conversation reports CodeQL, Python Security, Semgrep, Security Scan, Secret Scan, OSV, Scorecard, SBOM successful on this exact head and current-head check evidence does not contradict it. TDD/regression: no dedicated unit test for _redact_assignments surfaced in the CodeGraph changed-scope exploration; residual risk noted (a byte-parity test for zero/one/adjacent/trailing-match inputs would harden future refactors). Coverage: Coverage execution evidence — supported repository test suites passed. Docstring coverage: configured repository docstring gates passed or docstring coverage advisory per Coverage execution evidence. DAG: base-to-head flowchart of _redact_assignments changed flow (match/None branches to batched append and trailing flush) shown in the review body. PoC/execution: no execution receipts available in this isolated environment; conclusions rest on the trusted diff, source trace, check, and coverage evidence. DDD/domain: CI log-redaction utility, single bounded private function, no domain-model impact. CDD/context: secret-redaction context unchanged — replacement output text[start:value_start]+REDACTED is identical, so redaction coverage is preserved. Similar issues: earlier opencode-agent DISMISSED approval was driven by failed checks that current-head evidence no longer reports; no unresolved threads. Claim/concept check: PR body claim of behavior-preserving batching confirmed by source trace, and the PR correctly disclaims any asymptotic gain. Standards search: no external standard needed for this string-processing change. Compatibility/convention: private function, unchanged signature and output; new local identifier last_append is idiomatic two-word snake_case. Breaking-change/backcompat: none. Performance: list-append count reduced from O(n) to O(matches+2) while total copy work stays O(n), matching the PR claim. Developer experience: small readable diff in a CI redaction script. User experience: CI log consumers see identical redacted output. Visual/DOM: non-web change; non-web interaction surface reviewed is CLI/log-redaction output. Accessibility/i18n: no UI surface in this change. Supply-chain/license: no dependency changes. Packaging: scripts/ci/redact_sensitive_log.py belongs to the packaged Python project (pyproject.toml, requires-python >=3.10); no packaging change. Security/privacy: redaction coverage preserved — every consumed span [start, cursor) is replaced byte-identically and no credential bytes are newly exposed or dropped.
Approval sufficiency: bounded evidence supplied affirmative approval evidence for changed files, coverage/docstring posture, risk surfaces, and current-head verification; approval is not based merely on the absence of known blockers.
Verification posture: CodeGraph evidence was initialized and bounded current-head evidence reviewed for changed-file evidence including scripts/ci/redact_sensitive_log.py.
Linter/static: workflow/static review evidence is bounded by the current-head GitHub Checks gate and changed-file evidence.
TDD/regression: coverage execution evidence and focused changed hunks were reviewed from bounded-review-evidence.md.
Coverage: coverage execution evidence reports supported repository test suites passed.
Docstring coverage: coverage execution evidence reports configured repository docstring gates passed or docstring coverage was advisory.
DAG: CodeGraph/source-backed behavior map connects scripts/ci/redact_sensitive_log.py to the affected review, runtime, or workflow path and required checks.
PoC/execution: coverage-evidence job executed on the current head and reported PASS.
DDD/domain: workflow and repository-governance invariants were reviewed against changed files in bounded evidence.
CDD/context: CodeGraph evidence, changed-file history, and focused hunks were reviewed from bounded-review-evidence.md.
Similar issues: changed-file history evidence was reviewed for comparable local precedents.
Claim/concept check: bounded evidence, repository source, current-head workflow evidence, and, where numeric, scientific, statistical, or literature-backed claims are affected, original-paper/formula evidence and parameter-recovery expectations were used for claims.
Standards search: standards and external-source claims require trusted bounded source evidence prepared outside the isolated model process; no evidence-backed standards blocker is present in bounded evidence.
Compatibility/convention: changed workflow/script conventions, object naming, and reserved-word safety for schema/API/config/code surfaces were checked in bounded evidence.
Breaking-change/backcompat: deployment evidence and changed-file history were checked for backward-compatibility risk.
Performance: changed surfaces were checked for performance risk in bounded evidence.
Developer experience: changed automation, review, test, setup, and maintenance surfaces were checked for helpful or obstructive DX impact in bounded evidence.
User experience: connected user, operator, API, CLI, documentation, review-comment, status-check, rendering, and workflow-reader behavior was checked for contradictions against code, docs, and tests in bounded evidence.
Visual/DOM: deterministic repair does not infer browser runtime execution; source-backed DOM/UI evidence and trusted workflow receipts were reviewed when present, and non-web surfaces used API/CLI/log/docs/workflow evidence instead.
Accessibility/i18n: accessibility, localization, and human-readable text surfaces were checked where UI, CLI, API message, docs, logs, or review text changed.
Supply-chain/license: dependency, package, model, container, and external-tool changes were checked in bounded evidence.
Packaging: package, build, test, lint, and security contracts were checked in bounded evidence.
Security/privacy: workflow-token, review-gate, and repository-automation security/privacy boundaries were checked in bounded evidence.
Adversarial validation
{"status":"passed","probes":[{"path":"scripts/ci/redact_sensitive_log.py","line":102,"hypothesis":"Batching unchanged spans drops or duplicates plain/trailing characters compared with the base per-character append loop (e.g., a string with no sensitive assignments is truncated, or trailing text after the last match is lost).","attack_or_counterexample":"Inputs with zero sensitive assignments ('plain diagnostic text') and inputs with trailing text after the last assignment ('key=secret trailing') exercise the new last_append window and the final tail flush.","evidence":"Trusted source trace at scripts/ci/redact_sensitive_log.py:102 observed that last_append = 0 initializes the unchanged-span window so every advanced-but-unmatched position stays inside [last_append, cursor) and is flushed either by the pre-match slice output.append(text[last_append:cursor]) or by the trailing output.append(text[last_append:]) after the loop; with no matches the joined output is the full input, byte-identical to the base per-char appends; corroborated by Coverage execution evidence (supported repository test suites passed) and Failed GitHub Check evidence (no completed failed checks). source-line-sha256=8bf9e304e33d24abf22375d0320c99e4d248cf2c5c5e65d1669922fa630762f6","outcome":"falsified"},{"path":"scripts/ci/redact_sensitive_log.py","line":112,"hypothesis":"Consecutive or end-of-input sensitive assignments cause overlapping or double-appended spans (duplicated separators, re-emitted secret bytes, or an infinite loop), so the redactor output differs from base.","attack_or_counterexample":"Inputs with adjacent assignments ('k1=secret1,k2=secret2') and a match ending exactly at len(text) ('k=secret') challenge the cursor/last_append bookkeeping; a match where cursor == value_start is rejected by _consume_sensitive_assignment, so no zero-length match can loop.","evidence":"Trusted source trace at scripts/ci/redact_sensitive_log.py:112 observed that after each match last_append = cursor advances the window only to the consumed span end, keeping unchanged spans [last_append, next_match) disjoint from replacement spans, appending each replacement exactly once, and leaving the tail flush as text[len:] = '' for a match at end-of-input; the replacement text[start:value_start] + REDACTED is unchanged from base, so redaction coverage is byte-identical; corroborated by Coverage execution evidence (supported repository test suites passed) and Failed GitHub Check evidence (no completed failed checks). source-line-sha256=fb72f8955590893c5980ae5f0295c9d0b5212c36ae1b3c4df35c57574a7b11f6","outcome":"falsified"}],"residual_risk":"No dedicated unit test for _redact_assignments is surfaced in the CodeGraph changed-scope exploration; a focused byte-parity test against the base loop for zero-match, single-match, adjacent-match, quoted-value, and trailing-text inputs would harden future refactors. No runtime execution receipts were available in this isolated environment; verification rests on the trusted diff, source trace, check, and coverage evidence."}- Result: APPROVE
- Reason: Behavior-preserving batching refactor in _redact_assignments verified byte-for-byte against the base per-character loop by source trace; no failed current-head checks, no unresolved threads, coverage PASS.
- Head SHA:
46c3b063cf6850d7157c0dc9c21310a660447e76 - Workflow run: 31131310962
- Workflow attempt: 1
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@coderabbitai review Please review the exact live head only. Verify _redact_assignments remains single-pass and behaviorally identical while batching contiguous unchanged spans, retains every sensitive assignment and boundary regression, does not reintroduce unsupported asymptotic claims, and passes exact-head diagnostics, 100% production statement/branch/docstring coverage, CodeQL, Semgrep, secret scan, OSV, SBOM, scorecard, Python security, and zero unresolved threads. Review only; do not update the branch, approve through a non-independent identity, merge, release, or alter protections. |
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What
Refactors
_redact_assignmentsto append contiguous unchanged spans instead of appending one character per loop iteration. Redacted replacements and cursor advancement remain unchanged.Why
The previous implementation was already linear-time because it accumulated characters in a list and joined once. The improvement is therefore not an asymptotic O(N²)→O(N) change. It reduces Python-level
list.appendcalls and temporary one-character string objects for long unmatched regions while preserving the same single-pass behavior.Verification required at the exact current head
The unsupported complexity claim and generated learning-note change were removed from this PR.