stream: prefer sync iterator in fromSync#64294
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When an input provides Symbol.iterator, fromSync() should consume the synchronous iterator instead of rejecting the input because it also exposes an asynchronous or promise-like protocol. Continue rejecting async-only iterables and promise/thenable-only inputs, but allow sync iterables that also define Symbol.asyncIterator or then(). 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 inputs without a synchronousiteration path, allowing dual sync/async iterables and thenable sync
iterables to be consumed through their synchronous iterator.
Assisted-by: openai:gpt-5.5