Add support for PEP 661 (sentinels)#21647
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Signed-off-by: Edgar Ramírez Mondragón <edgarrm358@gmail.com>
Signed-off-by: Edgar Ramírez Mondragón <edgarrm358@gmail.com>
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This was referenced Jun 26, 2026
Signed-off-by: Edgar Ramírez Mondragón <edgarrm358@gmail.com>
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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d-v-b's call: PEP 661 is Final, ty already types the sentinel spelling exactly, mypy support is in review (python/mypy#21647) and treated as imminent, and pyright has a known-good version — so use the standard sentinel today rather than carrying the enum stopgap. - UNSET is now typing_extensions.Sentinel("UNSET"), used directly in type expressions (tuple[str | None, ...] | UNSET); the UnsetType companion enum is gone from the API. - typing_extensions floor bumped to 4.14 (where Sentinel arrived). - CI pins pyright==1.1.404, the last version before the class-attribute sentinel regression (microsoft/pyright#11115); pyproject documents the same pin for local runs. 0 errors on the pin; ty checks the sentinel fields clean (its 2 remaining diagnostics are its incomplete PEP 728 extra_items write support, unrelated). - Known short-term cost, accepted deliberately: mypy-checked consumers need cast/type-ignore at narrowing sites until mypy#21647 merges, and contributors' Pylance may show phantom Unknowns until the pyright fix ships. Recorded in _sentinel.py and the changelog. - The pydantic native-introspection test reverts to documenting that introspection is unsupported (pydantic 2.13 cannot schema a Sentinel); the delegation patterns are unaffected. Assisted-by: ClaudeCode:claude-fable-5
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See PEP 661 and python/typing#2277