Feat: Add signal safety as single commit by jlukic · Pull Request #213 · Semantic-Org/Semantic-Next

jlukic · 2026-05-18T19:09:20Z

Clean bench test for #212

vercel · 2026-05-18T19:09:25Z

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semantic-performance-bot · 2026-05-18T19:57:42Z

🟡 Mixed (mostly faster) for `4968ed3` on Benchmark Suite 📊

Base: main · Action: #26172216232 · Raw: bench-report.json

^{Feat: Add signal safety as single commit}

Warning

This PR improves ✅ 24 tests while regressing on ❌ 3 tests.

✅ 24 faster · ❌ 3 slower · 🔍 20 unsure · ⚪ 24 no change · 🏆 3 new peaks · 📜 8 reopened

✅ Faster (24) — top 5 shown

Metrics where this PR confidently improved performance compared to main.

metric	Improvement
`signal:reactive-set-property-by-id-200`	-99% (202ms) 🏆
`signal:reactive-set-index-300`	-99% (113ms) 🏆
`signal:reactive-list-filter-1000x300`	-96% (119ms) 🏆
`todo:rename-500`	-92% (187ms) 🏆
`signal:reactive-push-2000x20`	-83% (188ms) 🏆

Show all 24 faster metrics

metric	Improvement
`signal:reactive-set-property-by-id-200`	-99% (202ms) 🏆
`signal:reactive-set-index-300`	-99% (113ms) 🏆
`signal:reactive-list-filter-1000x300`	-96% (119ms) 🏆
`todo:rename-500`	-92% (187ms) 🏆
`signal:reactive-push-2000x20`	-83% (188ms) 🏆
`todo:remove-middle-100`	-80% (43ms) 🏆
`todo:remove-last-100`	-78% (39ms) 🏆
`todo:toggle-first-100`	-76% (44ms) 🏆
`todo:remove-50-front`	-73% (12ms) 🌟
`todo:toggle-middle-100`	-73% (32ms) 🌟
`todo:toggle-last-100`	-72% (34ms) 🌟
`todo:remove-first-100`	-71% (40ms) 🌟
`todo:toggle-100`	-69% (29ms) 🌟
`todo:remove-50-back`	-67% (9ms) 🌟
`todo:remove-50-middle`	-64% (9ms) 🌟
`signal:computed-subscribe-unsubscribe-10k`	-27% (3ms) ⭐
`signal:computed-unobserved-200x500`	-19% (5ms) ⭐
`signal:computed-chain-10x60k`	-11% (22ms)
`todo:add-20`	-11% (1ms)
`hydrate:helper-100-state-change-1k`	-11% (0ms)
`todo:toggle-all-200`	-9% (87ms)
`template:subtemplate-helpers-heavy-100x500`	-4% (2ms)
`signal:reaction-coalesce-400x100`	-4% (2ms)
`signal:reactive-multi-read-5x160k`	-4% (9ms)

❌ Slower (3)

Metrics where this PR confidently regressed performance compared to main.

metric	Regression
`todo:edit-cycle-5`	+27% (18ms) ❗
`signal:reaction-dep-diff-45k`	+7% (2ms)
`signal:reactive-stable-deps-3reads-5000x100`	+5% (10ms)

🏆 New peaks (3)

These metrics hit a new best on this PR. The most recent candidate is usually the cause.

metric	improvement	prior peak	likely candidates
`todo:edit-cycle-5`	19%	`2683d93`	`7041556`, `f36d043`, `7388c0b` (+2 more)
`todo:remove-first-100`	6%	`0dd3f4f`	`7041556`, `f36d043`, `7388c0b`
`todo:toggle-last-100`	6%	`f36d043`	`7041556`

📜 Regressions from peak (8)

These metrics were faster on an earlier push to this PR. The most recent candidate is usually where to look.

metric	regression	prior peak	likely candidates
`signal:reaction-dep-diff-45k`	20%	`2683d93`	`7041556`, `f36d043`, `7388c0b` (+2 more)
`todo:toggle-100`	9%	`7388c0b`	`7041556`, `f36d043`
`todo:remove-50-middle`	8%	`f36d043`	`7041556`
`template:each-mount-1000`	6%	`f36d043`	`7041556`
`todo:remove-50-back`	6%	`0dd3f4f`	`7041556`, `f36d043`, `7388c0b`
`todo:remove-last-100`	3%	`0dd3f4f`	`7041556`, `f36d043`, `7388c0b`
`todo:remove-50-front`	3%	`f36d043`	`7041556`
`todo:toggle-middle-100`	2%	`f36d043`	`7041556`

⚪ No Change (24)

Metrics where this PR measured within ±2% of main — no meaningful performance change detected.

metric	Change
`compiler-micros:ast-walk-15k`	-2.0% – +0.1%
`renderer-micros:build-html-string-10k`	-0.7% – +1.6%
`todo:bulk-add-500`	-1.1% – +0.6%
`krausest:create-10k`	-0.6% – +0.4%
`krausest:create-1k`	-1.1% – +1.0%
`hydrate:each-100`	-1.8% – -0.0%
`hydrate:each-100-mount`	-1.7% – -0.2%
`todo:edit-start-10`	-1.2% – +1.0%
`renderer-micros:expr-lisp-50k`	-1.2% – +0.8%
`renderer-micros:expr-simple-100k`	-0.4% – +1.4%
`todo:filter-cycle-20`	-0.5% – +0.9%
`signal:flush-fanout-allocation-1000x500`	-1.1% – +0.6%
`hydrate:helper-100-mount`	-0.7% – +2.0%
`compiler-micros:parse-cold-complex-200`	-1.2% – +0.5%
`compiler-micros:parse-cold-normal-500`	-1.9% – +0.9%
`signal:reaction-flush-noop-5m`	-1.1% – +0.0%
`signal:reactive-fanout-500x1200`	-1.1% – +0.3%
`signal:reactive-stable-fanout-5000x100`	-0.0% – +1.3%
`krausest:replace-1k`	-1.5% – +1.5%
`krausest:select-40`	+0.2% – +0.9%
`compiler-micros:snippet-args-5k`	-1.1% – +0.4%
`template:subtemplate-data-blob-100`	-0.6% – +0.8%
`template:subtemplate-helpers-light-100x500`	-1.0% – +1.4%
`template:subtemplate-shorthand-props-100x500`	-1.7% – +1.2%

🔍 Unsure (20)

Too Fast to Measure Precisely (20)

On benches this short, OS jitter, GC, and JIT pauses drown out anything under 4%. Bigger changes than that still show up.

metric	Change	Test Time	Expected Noise
`template:active-indicator-200`	-2.4% – +1.4%	~31ms	±6%
`template:active-indicator-nested-200`	-5.1% – +0.1%	~15ms	±9%
`krausest:append-1k`	-1.6% – +2.0%	~87ms	±4%
`krausest:clear-10k`	-2.0% – +3.2%	~131ms	±7%
`todo:clear-completed-250`	-3.4% – -0.6%	~40ms	±4%
`renderer-micros:dom-walker-1000x15`	-2.7% – -0.4%	~49ms	±5%
`template:each-mount-1000`	+0.7% – +3.6%	~49ms	±6%
`renderer-micros:expr-js-10k`	-3.1% – -0.4%	~20ms	±6%
`signal:reactive-list-replace-1000x1000`	-2.0% – +0.8%	~320ms	±3%
`krausest:remove-row-back-100`	-13.6% – +6.3%	~22ms	±26%
`krausest:remove-row-front-20`	-6.6% – +5.4%	~10ms	±15%
`krausest:remove-row-middle-20`	-7.5% – +19.9%	~7ms	±32%
`signal:set-same-10m`	-0.3% – +2.5%	~19ms	±5%
`template:snippet-args-per-key-100x500`	-3.2% – +0.5%	~30ms	±5%
`template:snippet-in-subtemplate-100x1k`	-2.8% – +1.4%	~20ms	±8%
`template:stable-ref-mutate-500`	-3.6% – +1.7%	~13ms	±9%
`signal:sub-unsub-100k`	-0.2% – +3.4%	~29ms	±5%
`template:subtemplate-reactive-data-100x500`	-2.4% – +0.1%	~42ms	±4%
`krausest:swap-rows-20`	-1.4% – +8.7%	~120ms	±12%
`krausest:update-10th-50`	-7.9% – +3.1%	~25ms	±12%

📖 Bench glossary (71 metrics)

metric	what it tests
`compiler-micros:ast-walk-15k`	Walks a kitchen-sink AST through optimizeAST 15000 times. Merge, hoist, and recurse pass.
`compiler-micros:parse-cold-complex-200`	Compiles a feature-dense kitchen-sink template 200 times. Catches parser regressions on uncommon block paths.
`compiler-micros:parse-cold-normal-500`	Compiles a TodoMVC-style component template 500 times. Headline metric for normal-component compile throughput.
`compiler-micros:snippet-args-5k`	Parses four representative subtemplate-call shapes 5000 times each. Snippet args extraction.
`hydrate:each-100`	Reassigns the items of a hydrated 1000-item list to a fresh array with the same keys and data.
`hydrate:each-100-mount`	Hydrates a server-rendered 1000-item list and waits for it to become interactive without re-rendering.
`hydrate:helper-100-mount`	Hydrates a 1000-item list where each item calls a helper that reads state shared across the list.
`hydrate:helper-100-state-change-1k`	Walks the shared activeID across every item in a hydrated 1000-item list so two items repaint per cycle.
`krausest:append-1k`	Appends 1000 new rows onto an existing 1000-row table.
`krausest:clear-10k`	Clears a 10000-row table back to empty in a single operation.
`krausest:create-10k`	Renders a fresh 10000-row table into an empty parent at ten times the create-1k scale.
`krausest:create-1k`	Renders a fresh 1000-row table into an empty parent.
`krausest:remove-row-back-100`	Removes the last row 100 times from a 1000-row table, with no other rows needing to move.
`krausest:remove-row-front-20`	Removes the first row 20 times from a 1000-row table, with all remaining rows sliding up each time.
`krausest:remove-row-middle-20`	Removes the middle row 20 times from a 1000-row table, with the rows below it sliding up each time.
`krausest:replace-1k`	Replaces 1000 rows with a fresh 1000-row set, diffing the keyed list against a populated table.
`krausest:select-40`	Highlights one row at a time across 40 rows so only the previous and newly highlighted rows update.
`krausest:swap-rows-20`	Swaps the second and second-to-last rows in a 1000-row table, repeated 20 times.
`krausest:update-10th-50`	Updates the label on every tenth row of a 1000-row table, looped 50 times to lift the work above noise.
`renderer-micros:build-html-string-10k`	Builds the HTML string for a realistic card AST 10000 times. Raw assembly throughput.
`renderer-micros:dom-walker-1000x15`	Runs bindMarkers across a 1000-node card fragment 15 times. TreeWalker pass and binding dispatch.
`renderer-micros:expr-js-10k`	Evaluates one arithmetic expression and one ternary 10000 times each. JS-eval hot path.
`renderer-micros:expr-lisp-50k`	Evaluates one Lisp-style helper call 50000 times. Parse-cache lookup and helper dispatch.
`renderer-micros:expr-simple-100k`	Evaluates one simple identifier and one dotted path 100000 times each. Property-lookup hot path.
`signal:computed-chain-10x60k`	Propagates a value change from root to leaf through a 10-deep chain of derived signals 60000 times.
`signal:computed-subscribe-unsubscribe-10k`	10000 create-computed + attach-observer + detach cycles. Lifecycle cost the refcount path must keep acceptable.
`signal:computed-unobserved-200x500`	200 unobserved computed signals, root updated 500 times. Measures the eager-recompute cost the refcount removes.
`signal:flush-fanout-allocation-1000x500`	500 subscribers fanout across 1000 flush cycles. Each flush spreads pendingReactions; tests per-flush allocation churn.
`signal:reaction-coalesce-400x100`	Sets one signal 100 times then flushes once across 400 bursts so 100 subscribers wake one time per burst.
`signal:reaction-dep-diff-45k`	Toggles which of two signals a subscriber reads across 45000 cycles. Per-run dep-set diffing.
`signal:reaction-flush-noop-5m`	Calls Reaction.flush() 5000000 times with no pending work. Scheduler dispatch overhead.
`signal:reactive-fanout-500x1200`	Fans out one signal's value change to 500 subscribers across 1200 successive updates.
`signal:reactive-list-filter-1000x300`	Changes a search-term signal 300 times, re-scanning a 1000-item list on each change.
`signal:reactive-list-replace-1000x1000`	Replaces a 1000-item list signal with a fresh 1000-item array and rescans it 1000 times.
`signal:reactive-multi-read-5x160k`	Changes five signals in turn for 32000 rounds with one subscriber reading all five.
`signal:reactive-push-2000x20`	Appends 20 items onto an empty list signal with a subscriber, across 2000 reset cycles.
`signal:reactive-set-index-300`	Replaces one item by index in a 1000-item list signal across 300 updates, with a subscriber.
`signal:reactive-set-property-by-id-200`	Finds an item by id and updates one field in a 1000-item list signal across 200 alternating updates.
`signal:reactive-stable-deps-3reads-5000x100`	5000 reactions × 3 signals × 100 cycles. Each run clears + re-adds 3 stable dep edges.
`signal:reactive-stable-fanout-5000x100`	5000 reactions × 1 signal × 100 invalidations. Per-run Set.delete + add on a stable dep edge.
`signal:set-same-10m`	Sets a signal to its current value 10000000 times. Exercises the no-op fast path when nothing changes.
`signal:sub-unsub-100k`	Creates and tears down a subscriber on one signal across 100000 cycles. Subscription churn cost.
`template:active-indicator-200`	Cycles selectedId across 200 list items. Only the previously and newly active items update their class.
`template:active-indicator-nested-200`	Cycles currentUrl through 50 leaf urls in a 5×10×4 nav. Only the previously and newly active leaves should update their…
`template:each-mount-1000`	Mounts a fresh 1000-item each block with five-field items so per-record allocation cost dominates the wall clock.
`template:snippet-args-per-key-100x500`	Mutates one snippet arg's source across 100 invocations, 500 cycles. Adjacent no-signal expressions stay quiet.
`template:snippet-in-subtemplate-100x1k`	Mutates one subtemplate prop's source across 25 cards each invoking 4 inner snippets, 1000 cycles. Snippet bodies shoul…
`template:stable-ref-mutate-500`	Replaces one item by index in a 500-item list across 100 cycles. Only that item's expressions re-render.
`template:subtemplate-data-blob-100`	Mutates one field inside data=expression on 100 children. Every child re-renders by design.
`template:subtemplate-helpers-heavy-100x500`	100 subtemplates, 4 inner bindings where three call helpers shaped like userland reality — Intl.NumberFormat, Array.fin…
`template:subtemplate-helpers-light-100x500`	100 subtemplates, 4 inner bindings each calling formatDate / classIf / capitalize, 500 cycles. Mutates one source signa…
`template:subtemplate-reactive-data-100x500`	Mutates one verbose reactiveData field across 100 child subtemplates, 500 cycles. Only the changed field re-evaluates.
`template:subtemplate-shorthand-props-100x500`	Mutates one shorthand prop's source across 100 child subtemplates, 500 cycles. Only that prop re-evaluates.
`todo:add-20`	Appends 20 todo items one at a time, like a user typing entries in a row.
`todo:bulk-add-500`	Renders 500 todo items added at once from a single data load.
`todo:clear-completed-250`	Clears 250 completed items from a 500-item list in one action, like clicking clear completed.
`todo:edit-cycle-5`	Runs 5 full edit-then-save cycles on different items, like editing a row and saving it.
`todo:edit-start-10`	Enters edit mode on 10 different items in a row, like double-clicking each one.
`todo:filter-cycle-20`	Cycles through active, completed, and all filters 20 times on a 100-item list.
`todo:remove-50-back`	Deletes 50 items from the end of a 100-item list, one click at a time.
`todo:remove-50-front`	Deletes 50 items from the front of a 100-item list, one click at a time.
`todo:remove-50-middle`	Deletes 50 items from the middle of a 100-item list, one click at a time.
`todo:remove-first-100`	Deletes the first item 100 times from a 200-item list, with remaining items moving up each time.
`todo:remove-last-100`	Deletes the last item 100 times from a 200-item list, with no other items needing to move.
`todo:remove-middle-100`	Deletes the middle item 100 times from a 200-item list, walking halfway through to find each target.
`todo:rename-500`	Renames items in a 100-item list 500 times via single-field setProperty without editingId co-fires.
`todo:toggle-100`	Cycles through the first 10 items 10 times each, like a user toggling items repeatedly down a list.
`todo:toggle-all-200`	Toggles all 100 items completed and back across 200 cycles via the master checkbox.
`todo:toggle-first-100`	Toggles the first item in a 100-item list 100 times, alternating completed on and off.
`todo:toggle-last-100`	Toggles the last item in a 100-item list 100 times, alternating completed on and off.
`todo:toggle-middle-100`	Toggles a middle item in a 100-item list 100 times, alternating completed on and off.

_{Sample size: 80 floor / 280 max · Noise floor: ±2% · Timeout: 3min · Wall-clock: 12m51s}

The refChanged branch in each.js Phase 3 called refreshSnapshotAndDetect (which updates snapshot in place) and then unconditionally overwrote it with a fresh createSnapshot allocation. Reference mode hits this branch on position-change reconciles (e.g. filter cycling, list reordering); clone mode never enters it because identity churn routes through the sibling isArrayAsMode branch which doesn't have the double-snapshot. Match the sibling branch's pattern: only createSnapshot when no prior object snapshot existed.

The fresh-take agents (Challenge + Survey + Neutral) all flagged that set-same-10m and sub-unsub-100k regressing under reference safety is inexplicable from the primitive-Signal hot path itself (protect() early-returns before reading this.safety; bytecode is identical to clone mode). The convergent hypothesis is that the regression is inherited cross-bench state: the upstream list-Signal benches do dramatically different allocation/cloning work in clone vs reference mode, leaving V8 with different JIT feedback / heap layout / GC pressure when the primitive benches execute later in the same Chrome session. Running the primitives first isolates them. If the regressions persist at the top of the script, the cause is intrinsic to the primitive path. If they disappear, the cause is cross-bench state — diagnostic, not a production code change.

This reverts commit 855e221.

Captures the flow that produced real results in the signal-safety investigation: chrome-devtools MCP traces, counter instrumentation of bundled framework, local tachometer with custom-built bundles, fresh-take subagents when reasoning loops. Documents the dead ends that didn't work — static reading, V8 hypothesis without skill citation, pushing bench-file changes that get overlaid away.

…nd evidence integrity Adds a fixed bench-weight heuristic (krausest 5x / todo·template·hydrate 2x / synthetics 0.25x) with a gate that the heaviest real-workload regressor must be measured, not reasoned about by analogy. Splits the instrument flow into gather (trace, baseline diff — no hypothesis) and steelman (counters/Playwright — hypothesis required), with the hypothesis born from a measurement rather than a read. Adds an orientation step: read the bench and learn how the component works user-side via the authoring curriculum, since the renderer is a separate package from the component surface. Adds an evidence-integrity rule for handling prior cause-claims, and keeps the no-bench-editing guardrail.

Reframes the weight heuristic as a focus-and-coverage budget (which suite to dig, what the report owes each regressor) rather than an investigation stopwatch, and adds the contrast principle: a bench that did not regress is a control, and the delta between a regressor and a flat near-neighbor localizes the cause. Names deflection as the anti-pattern to watch for, with the tell that reasoning toward it sounds composed and rigorous, so the check is direction not felt-soundness. Keeps firmness for the calibration refusal (a methodology stall without a demonstration is not grounds to stop) while removing scolding tone.

…ormance Makes the skip-prone steps into checkable stops. Orientation gate: write the expected-reactivity prediction (from the template AST and component model) before tracing, so the regression reads as the gap between expected and measured. V8 gate: V8-internals claims cite the current performance-v8 skill, framed as a recency patch (training knowledge predates the May-2026 skills), not a competence check. Grounding gate: name the AST node or construct before asserting a mechanism. Adds a Parse-the-template step (validate_template with includeAST) and a Step 9 fix-and-confirm. Gates verify the produced artifact rather than surveilling the agent.

…investigate-performance From the first real run of the gated skill. Adds: a uniform effect can't explain a non-uniform profile (a multiplier identical on winners and losers is shared/inherited state, not a per-bench cause); ablation as the most decisive confirmation (remove the cause, show the effect vanishes and the win survives); 'it's just a machine difference' named as a dead end when local sign reproduces but CI magnitude doesn't; ground where the measurement points (plumbing, not only the user-facing component); and performance as iterative — a named residual is an honest loop boundary, relabeling it noise is not.

A plain-object walk copied index keys onto a bare object and dropped the backing buffer. Delegate binary leaves to structuredClone, which is both correct and faster here. Adds a clone-vs-structuredClone bench.

…tState defaultState is the definition's declaration and is correctly shared across instances (Template.clone manifests, it does not duplicate). The leak was that in reference mode each instance's Signal aliased that shared default and a mutation wrote through into the prototype. Isolate at the seam where instance state is derived from the defaults — clone the seeded object value per Signal — instead of cloning defaultState at clone(). Restores the shared-defaultState contract (subtemplate-settings Template.clone tests pass unchanged) and keeps the per-read reference win.

Feat: Add signal safety as single commit

2683d93

github-actions Bot added Templating Modifies templating package Reactivity Modifies reactivity package Tests Modifies tests Utils Modifies utilities package labels May 18, 2026

jlukic closed this May 18, 2026

vercel Bot deployed to Preview – semantic-next May 18, 2026 19:11 View deployment

jlukic reopened this May 18, 2026

Feat: Swap to reference safety by default.

0dd3f4f

vercel Bot deployed to Preview – semantic-next May 18, 2026 20:04 View deployment

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Revert "Bench: Move primitive-Signal benches to top of bench-signal.js"

f36d043

This reverts commit 855e221.

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github-actions Bot added the Docs Modifies documentation label May 18, 2026

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jlukic added 2 commits May 19, 2026 23:37

Test: Fix tests with new expects from new signal safety shape

4b162d6

Bug: Fix each bug from signal pass by ref on hydration

b630249

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Harness: Update investigate performance skill

c6deb69

vercel Bot deployed to Preview – semantic-next May 20, 2026 03:51 View deployment

Merge branch 'main' into feat/signal-safety-bench

7041556

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jlukic added 2 commits May 20, 2026 09:42

Harness: add notes on emotional register to author coontext

82d3de2

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Bug/Perf: Clone defaultState on template instance

bfcc6dd

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jlukic added 2 commits May 20, 2026 11:08

Bug(utils): Clone typed arrays, ArrayBuffer, and DataView correctly

0ddda79

A plain-object walk copied index keys onto a bare object and dropped the backing buffer. Delegate binary leaves to structuredClone, which is both correct and faster here. Adds a clone-vs-structuredClone bench.

Bug/Perf: Fix binary data in clone()

1e4295a

vercel Bot deployed to Preview – semantic-next May 20, 2026 15:12 View deployment

jlukic added 3 commits May 20, 2026 11:19

Merge branch 'main' into feat/signal-safety-bench

f9a745d

Refactor: Use isObject helper for the default-value clone guard

4968ed3

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Feat: Add signal safety as single commit#213

Feat: Add signal safety as single commit#213
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🟡 Mixed (mostly faster) for 4968ed3 on Benchmark Suite 📊

✅ Faster (24) — top 5 shown

❌ Slower (3)

🏆 New peaks (3)

📜 Regressions from peak (8)

Too Fast to Measure Precisely (20)

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🟡 Mixed (mostly faster) for `4968ed3` on Benchmark Suite 📊