unittest

`_ConcurrentFlattenIterable`: improve performance #422

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Run time

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Job	Run time
unittest (3.7.17)	2m 1s
unittest (3.8.18)	1m 55s
unittest (3.9.18)	2m 8s
unittest (3.10.13)	2m 3s
unittest (3.11.7)	2m 4s
unittest (3.12.1)	2m 4s
	12m 15s