Replication of original PR #594: Add support for sentinels (PEP 661) #1
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PR Summary
Add Sentinel class for unique typing sentinel objects
Overview
This PR adds a new
Sentinelclass to create unique sentinel objects for typing purposes, with special handling for Python versions before 3.11. The class is exposed as a public API and includes comprehensive test coverage.Change Types
Sentinelclass for typing purposesSentinelclassAffected Modules
typing_extensions.pySentinelclass and exposed it in__all__test_typing_extensions.pySentinelclassNotes for Reviewers