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gh-149083: Convert some private and simple sentinels to PEP 661 #256759

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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 #256759

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Job	Run time
Unresolved review	6s
DO-NOT-MERGE	4s
	10s

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