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Description of changes
Iterators produced by Iterable now have the correct prototype chain through IteratorPrototype, with next as enumerable/writable/configurable and
[Symbol.iterator]()returningthis. AddedIterable::from_fnfor closure-based iterators that can reference live data, which is needed for Web API methods like Headers.keys(). Removed the old two-level iterable/iterator indirection. Iterable now produces an iterator object directly.Checklist