[steipete]

AI-assisted: prepared and reviewed with AI coding agents; the results below come from the commands shown.

Summary

The first value-bound select, its form, and its first bound value can remain reachable after disposal. writeSelectValue creates the module-global selectInsert callback inside a per-select activation. Both queued closures capture that activation: the nullish branch captures node and value, and the trailing retry captures node. V8 shares that context with the stored callback, retaining the first node and bound value, possibly a multi-select array. Removing only the trailing closure still leaks.

Move the callback to module scope, preserving lazy installation and both microtasks. SSR never reaches this code.

How did you test this change?

• pnpm --dir packages/web exec vitest run --maxWorkers=1: 161 files, 1,439 tests passed. The inspector-GC regression fails on the original source and passes with the patch, without --expose-gc.
• JSX_COMPILER=babel pnpm --dir packages/web exec vitest run --config vite.config.hydrate.mjs --maxWorkers=1: 123 files passed, 1 skipped; 520 tests passed, 16 expected failures, 2 skipped.
• pnpm --dir packages/web exec vitest run --config vite.config.server.mjs --maxWorkers=1: 201 files passed; 1,790 tests passed, 3 expected failures, 2 skipped.

Differential tests covered initial and late options, multi-select, optgroups, and reactive, nullish and same-turn updates. The existing client, hydration and server suites pass unchanged, including select-multiple, select-async-value and server select-value specs.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8fddce9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 15 packages

Name	Type
@solidjs/web	Patch
@solidjs/babel-plugin	Patch
@solidjs/diagnostics	Patch
@solidjs/element	Patch
@solidjs/h	Patch
@solidjs/html	Patch
test-integration	Patch
board-example	Patch
canvas-example	Patch
server-dbmon-example	Patch
todos-server-example	Patch
@solidjs/compiler	Patch
@solidjs/signals	Patch
solid-js	Patch
@solidjs/universal	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[codspeed]

Merging this PR will improve performance by 15.07%

2 warnings

⚠️ 4 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

Learn more about Macro Runners

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 195 untouched benchmarks
⏩ 5 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	memo + sync render effect only (reference)	34 ms	29.6 ms	+15.07%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing steipete:fix/select-insert-retention (8fddce9) with next (253561e)}

Footnotes

1. 5 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩