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gh-137597: Clarify flattening and bugfix for itertools.tee #195482

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gh-137597: Clarify flattening and bugfix for itertools.tee

gh-137597: Clarify flattening and bugfix for itertools.tee #195482

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Job	Run time
DO-NOT-MERGE	3s
Unresolved review	3s
	6s

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