gh-149083: Convert some private and simple sentinels to PEP 661#149084
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JelleZijlstra wants to merge 1 commit intopython:mainfrom
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gh-149083: Convert some private and simple sentinels to PEP 661#149084JelleZijlstra wants to merge 1 commit intopython:mainfrom
JelleZijlstra wants to merge 1 commit intopython:mainfrom