Refactor Sentinel to conform to PEP 661#617

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HexDecimal wants to merge 10 commits intopython:mainfrom

HexDecimal:conforming-sentinel

Commits on Jun 4, 2025

Commits on Jun 5, 2025

Commits on Jun 10, 2025

Store Sentinel parameters in reduce method
HexDecimal
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Commits on Jul 1, 2025

Reduce Sentinel as singletons
HexDecimal
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Commits on Jul 4, 2025

Remove Sentinel import code
HexDecimal
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Commits on Jul 6, 2025

Warn if a Sentinel repr does not match its initial definition
HexDecimal
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Commits on Jul 24, 2025

Forbid Sentinel conversion to bool
HexDecimal
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