Adds Attribute(store1, store2, ...) as a Tag-shaped array-part value
object that projects one or more Stores' named Source fields onto
native Roblox attributes in one binding, with .Merged for combining
heterogeneous Stores. Rejected: a bare [Attribute] = Store{...} hash
slot (only one slot per instance, can't merge heterogeneous stores)
and making Attribute a Store subtype (would let Store<T>'s T be a
Store again, colliding with the existing "handler-layer values can't
live in Source" rule). Verified the value-slot aggregation in .Merged
doesn't reopen the earlier "layered Store" rejection (archive/
context-rejected.md) since it's an explicit one-time author-time
composition, not an implicit read-time parent-chain fallback.
Renamed the existing single-key constructor Attribute<<T>>(name) to
AttributeKey<<T>>(name) to remove the name collision with the new
group primitive (provisional per existing OnChange/OnChangeKey
precedent; final bikeshed still queued in question.md).
Follow-up: AttributeKey(name) now memoizes through a name-keyed weak
table, guaranteeing AttributeKey(a) == AttributeKey(a) while any
strong reference (e.g. a live Dispatch chain entry) keeps it alive.
This let the group Attribute handler drop its originally-planned
self-contained SetAttribute/subscription logic and instead recurse
into the existing single-key AttributeKey dispatch path per field,
reusing its None/retract/store-bind handling instead of duplicating
it — the group handler's own state shrinks to just a prior-name-set
diff for deciding which keys to retractUnder. The same memoization
was applied to OnChangeKey for the same reason (pure name-to-key
mapping, no other varying state), confirmed safe even once
State<function> callbacks are involved.
Reflected across base/attribute-plan.md, base/onchange-plan.md,
base/architecture.md (source tree + Brand isX list), ROADMAP.md M2/M10,
question.md, README.md, and the luau-test type-narrowing spike.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
base/ 확정 사항 중 아직 실제 Luau로 부딪혀본 적 없는 것(M0 스파이크
대상)을 사용자가 luau/luau-analyze/luau-lsp/Roblox Studio로 직접
돌려볼 수 있는 독립 실행 스크립트 14개 + README 색인으로 정리. 커밋
f198fd9의 정정사항(Ref 콜백/대기자 배열 소진을 None에서 nil로 되돌린
것 등)을 반영해 02번을 재작성했고, 타입 관련 실측이 필요한 항목
(Attribute 제네릭 DI 키 narrowing, Ref/PreRef 구조적 서브타입, Source/
Ref nilable-default 오버로드)을 새로 찾아 12~14번으로 추가함. 처음엔
git 자동 제외 폴더(luau-ignoreme/)에 만들었으나 커밋해서 레포에
남기기로 해 .claude/luau-test/로 이동, .claude/README.md에 색인 추가.
CLAUDE.md에 세션 요약 반영 — 아직 실행 결과는 미확인.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
