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gh-149083: Convert some private and simple sentinels to PEP 661 #264662

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gh-149083: Convert some private and simple sentinels to PEP 661

gh-149083: Convert some private and simple sentinels to PEP 661 #264662

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Job	Run time
Unresolved review	5s
DO-NOT-MERGE	4s
	9s

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