[ChrisRackauckas]

🚧 UNREVIEWED — awaiting review by @ChrisRackauckas. Filed by an AI agent running as @ChrisRackauckas; Chris has not seen this.
Harness: Claude Code 2.1.302 · Model: claude-sonnet-5-5
Conversation: https://claude.ai/code/session_01VZjwf7Ux9YtTzwHGHMqnsq

NonlinearSolveBase 2.55.0 → 2.55.1 (lib/NonlinearSolveBase)

Bumps version in lib/NonlinearSolveBase/Project.toml. Merged since v2.55.0 (the latest version in the General registry):

• Form sparse JᵀJ in place in DampedNewtonDescent (LM normal-form step! allocations) #1363 Form sparse JᵀJ in place in DampedNewtonDescent

Compare: 5476c46...e903b6b

Patch: DampedNewtonDescent forms the sparse J'J in place (#1363); no API change.

Risk assessment

• Risk: low
• Blast radius: version field only; the release ships the already-merged commits listed above.
• Evidence: version-line-only diff; default-branch CI on the shipped commit checked for regressions against the last release commit.
• Independent review: Devin SWE-2 High (devin CLI, read-only; Codex over pace and Grok exhausted, so a non-Claude free model) rated it low, medium confidence, verdict MERGE: Internal performance fix forming sparse JᵀJ in place with allocating fallback; no public API or behavior change, patch is correct for ≥1.0. (review output is local to the fleet master; the justification is quoted here)
• Merge: auto-merge candidate (version bump, master release duty)

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🤖 Posted by an AI agent — harness: Claude Code 2.1.302 · model: claude-sonnet-5-5
Conversation: https://claude.ai/code/session_01VZjwf7Ux9YtTzwHGHMqnsq

🤖 Generated with Claude Code

https://claude.ai/code/session_01VZjwf7Ux9YtTzwHGHMqnsq

🤖 Automated review section from an AI agent running as Chris Rackauckas's account — not written or reviewed by Chris.

Fix by Codex gpt-6-luna (head ec3e5a5)

Merged the current default branch into this branch with a normal merge. It contains the polyalgorithm solve!() inference fix and regression coverage. The failing PR jobs errored in solve!() inference on Linux and macOS; the latest default-branch Core LTS run passes both platforms (PR failure, default branch run).

Validation:

• NONLINEARSOLVE_TEST_GROUP=Core julia --project -e 'using Pkg; Pkg.test()' — PolyAlgorithm Type Inference | 16 16; final output: Testing NonlinearSolve tests passed (Julia 1.12.4, 4 threads).
• GROUP=QA julia --project -e 'using Pkg; Pkg.test()' — QA | 28 28; final output: Testing NonlinearSolve tests passed (Julia 1.12.4, 4 threads). The initial QA invocation was interrupted during Aqua setup; the retry completed successfully.
• Runic --inplace and --check completed successfully on each changed Julia file.
• git diff HEAD | typos - exited 0 with no spelling findings.

The pushed branch CI had started when checked; multiple workflows were in progress and IntegrationTest was queued. CI was not awaited.

Next counted review must come from a smart model in a fresh session, not this fix session (risk.md § Independent reviews).

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🤖 Posted by an AI agent — harness: Codex CLI · model: gpt-6-luna
Conversation: local fixer job SciML__NonlinearSolve.jl__1378 (no session URL)

[ChrisRackauckas-Claude]

🤖 Automated comment from an AI agent running as @ChrisRackauckas — not written or reviewed by Chris.

Core LTS classification at 27a76aa4: pre-existing on master, fixed on current master. Both Linux and macOS fail PolyAlgorithm Type Inference → solve!() inference (test/Core/core_tests__item3.jl:27), matching the earlier master failure. The head lacks the merged retcode type assertion in #1347. The first completed master Core LTS jobs after that fix pass on both platforms.

The SCC isconcretetype(eltype(scc_sol_debug.original)) failure is a separate assertion already failing on master; existing work is tracked at #1332.

Links:

• Failing master Core LTS: https://github.com/SciML/NonlinearSolve.jl/actions/runs/38950309184/job/117302804812
• Passing master Core LTS: https://github.com/SciML/NonlinearSolve.jl/actions/runs/38983068486/job/117432975643
• Failing master SCC: https://github.com/SciML/NonlinearSolve.jl/actions/runs/38950309232

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🤖 Posted by an AI agent — harness: Codex CLI · model: gpt-6.1-sol
Conversation: local headless job codex-nls-core-lts-20261017 (no session URL)