Use updated te branch, add core schema

Author: Viicos

pyproject.toml

@@ -36,7 +36,7 @@ classifiers = [
     'Typing :: Typed',
 ]
 dependencies = [
-    'typing-extensions@git+https://github.com/python/typing_extensions',
+    'typing-extensions@git+https://github.com/HexDecimal/typing_extensions@conforming-sentinel',
 ]
 dynamic = ['license', 'readme', 'version']
 

python/pydantic_core/__init__.py

@@ -145,7 +145,7 @@ class MultiHostHost(_TypedDict):
     """The port part of this host, or `None`."""
 
 
-UNSET = Sentinel('UNSET')
+UNSET = Sentinel('UNSET', module_name='pydantic_core')
 """A singleton indicating a field value was not set during validation.
 
 This singleton can be used a default value, as an alternative to `None` when it has

python/pydantic_core/core_schema.py

@@ -1341,6 +1341,16 @@ class Color(Enum):
     )
 
 
+class UnsetSentinelSchema(TypedDict, total=False):
+    type: Required[Literal['unset-sentinel']]
+
+
+def unset_sentinel_schema() -> UnsetSentinelSchema:
+    """Returns a schema for the [`UNSET`][pydantic_core.UNSET] sentinel."""
+
+    return {'type': 'unset-sentinel'}
+
+
 # must match input/parse_json.rs::JsonType::try_from
 JsonType = Literal['null', 'bool', 'int', 'float', 'str', 'list', 'dict']