[kixelated]

Problem

The maintainer decided quest/m3/ts-vec-clear-capacity.md on 2026-11-03. That decision conflicts with the 2026-11-02 one, recorded in ts-vec-exact-capacity.md, to keep only std's capacity guarantees: clear and truncate keeping the capacity is itself a documented guarantee.

Approach

• Records the prompt in the quest's Plan, with ✅ on the pick: measure ts-vec-exact-capacity's untried wrapper first, then choose.
• The Plan now opens with that measurement: a Vec object holding its own length and capacity over its array, timed on push/stack and the other TS benchmarks in Node, Chrome, Bun, and Firefox. The comparison is peak tracking's 1.24x, 1.11x, 2.3x, and 2.8x. The numbers come back to choose between the wrapper, fixing it at the measured cost, and documenting the divergence.
• The Plan notes the quest may merge with ts-vec-exact-capacity.md once measured, since a wrapper that holds its own capacity would give std's exact capacity too.
• One sentence in the Goal says the measurement decides how, or whether the divergence is documented instead.
• ts-vec-exact-capacity.md's untried-wrapper bullet now points to this quest as the one that measures it first.
• moq-dev/rust2#527 has landed, so the reference to ts-clone-from-capacity.md under ## Related is now a path link. This was chore(quest): plan keeping a pushed Vec's capacity as it shrinks #531's follow-up.

Impact

• Public API: none, quests only.

Alternatives

• Fold this quest into ts-vec-exact-capacity.md now: whether they share one fix depends on the measurement, so they stay separate until then.

Follow-ups

None.

Review

Skipped: a quest-only change of planning prose that records a maintainer decision. just check passed on head b600a9ab607a766c9b9e064ceed5d2482d323a66.

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Files selected for processing: 2

• quest/m3/ts-vec-clear-capacity.md
• quest/m3/ts-vec-exact-capacity.md

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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