stream: prefer sync iterator in fromSync#64294
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When an input provides both Symbol.iterator and Symbol.asyncIterator, fromSync() should consume the synchronous iterator instead of rejecting the input as async. Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com> Assisted-by: openai:gpt-5.5
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Fixes: #64292
stream/iter'sfromSync()rejected any input that exposedSymbol.asyncIterator, even when the same input also exposedSymbol.iterator.This updates
fromSync()to reject only async-only iterables, allowing dualsync/async iterables to be consumed through their synchronous iterator. A
regression test covers the dual-iterator case.
Assisted-by: openai:gpt-5.5