Version 1.3.3

What's Changed

Changed

• List.buildValue() uses a push loop instead of map/filter: Eliminates the intermediate (T | undefined)[] allocation that map() produced before filter() could remove undefined entries. Now builds the result in a single pre-allocated pass.
• List.sort() uses an imperative loop: Replaces keys.map(key => [key, signals.get(key)?.get()]).sort(...).map(([key]) => key) with a single entries build loop and a separate newOrder accumulation loop, removing two intermediate array allocations.
• List.splice() and List.replace() use boolean flags for change detection: Replaces Object.keys(changes.change).length (iterates all keys to count) with an early-exit for...in loop that sets a flag on the first key found.
• List.add() drops redundant keys.includes(key) guard: The preceding signals.has(key) check already throws DuplicateKeyError for duplicate keys; keys.includes(key) was unreachable dead code.
• diffArrays split into diffPositional for non-content-based keys: Positional-key lists now take a dedicated fast path (diffPositional) that walks both arrays in a single O(n) pass with no Map or Set allocation. Content-based diffing retains the Map/Set approach for key-stability tracking.
• syncKeys in deriveCollection reduces Set allocations: Previously constructed two Sets (new Set(keys) and new Set(nextKeys)). Now constructs only nextSet = new Set(nextKeys) for deletion detection and uses the existing signals Map directly (signals.has(key)) to decide whether a key needs to be added.
• Store.buildValue() and Store[Symbol.iterator] iterate Map entries directly: buildValue replaces signals.forEach((signal, key) => ...) with for (const [key, signal] of signals). The iterator replaces Array.from(signals.keys()) and a secondary signals.get(key) lookup with a single for...of over signals entries, eliminating an intermediate array allocation.
• Slot type assertion cleanup: Removed as any casts in isSignalOrDescriptor and createSlot.set; used return void delegated.set(next) in the Slot-to-Slot delegation path to avoid implicitly returning the inner call's result.

New Contributors

• @enesgules made their first contribution in #46

---

Full Changelog: v1.3.2...v1.3.3