[Nelmad]

With maxSize: 2, calling a memoized function with (10, 1) and (11, 2) over three passes currently computes six times and returns new references. Each new primitive argument node consumes capacity, so generations rotate before two results fit. This change computes twice and preserves both references.

Count each successfully cached or promoted argument tuple containing a primitive once per generation. Current-generation hits and failed calls do not consume capacity; separate tuples still count separately when resultEqualityCheck reuses a result reference. Object-only calls continue to rely on WeakMap garbage collection.

Bounded caches publish new paths only after callbacks succeed, preventing failed calls from retaining primitive branches. Regression tests cover shared prefixes, reference stability, promotion and eviction, mixed object/primitive arguments and garbage collection, maxSize: 1, clearing, exceptions, result equality, and reentrant callbacks. The default unbounded traversal stays separate to preserve its hot path.

Validation on macOS arm64 with Node 24.22.1 and pnpm 11.23.0:

• pnpm test: 162 runtime tests passed, with one existing skip and three existing todos; 29 type tests passed, plus the loose-null-checks compiler run.
• pnpm lint, pnpm format:check, and git diff --check passed.
• pnpm build passed. Smoke checks passed for all five generated JavaScript bundles and both CJS entry modes; a consumer of the generated declarations compiled successfully.

Paired local production benchmarks against the base branch found no confirmed slowdown in the tested default-path cases. Bounded-path microbenchmarks with matching computation counts measured approximately 14% slower single-primitive hits, 29–44% slower promotions, and 12–20% slower misses (roughly 2–24 ns per call on the test machine). These synthetic measurements capture the cost of deferred writes and are not application-level latency estimates.

Fixes #829

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