Implement AsyncIterator Helpers#2366
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Add AsyncIterator as a global constructor with: - AsyncIterator.from() static method for wrapping async/sync iterables - Prototype helper methods: map, filter, take, drop, flatMap - Prototype reducing methods: reduce, toArray, forEach, some, every, find - Symbol.toStringTag returning "AsyncIterator" - WrapForValidAsyncIterator for non-instanceof wrapping Mirrors the existing sync Iterator Helpers architecture with promise-based chaining via PerformPromiseThen for all async operations. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
AsyncIteratoras a global constructor withfrom()static method for wrapping async/sync iterablesmap,filter,take,drop,flatMapreduce,toArray,forEach,some,every,findSymbol.toStringTagreturning"AsyncIterator"WrapForValidAsyncIteratorfor non-instanceof wrappingMirrors the existing sync Iterator Helpers architecture with promise-based chaining via
PerformPromiseThenfor all async operations.Test plan
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