Support specification of strict on Enum type fields

pydantic/_internal/_known_annotated_metadata.py

@@ -37,6 +37,7 @@
 DATE_TIME_CONSTRAINTS = {*NUMERIC_CONSTRAINTS, *STRICT}
 TIMEDELTA_CONSTRAINTS = {*NUMERIC_CONSTRAINTS, *STRICT}
 TIME_CONSTRAINTS = {*NUMERIC_CONSTRAINTS, *STRICT}
+LAX_OR_STRICT_CONSTRAINTS = {*STRICT}
 
 UNION_CONSTRAINTS = {'union_mode'}
 URL_CONSTRAINTS = {
@@ -85,6 +86,8 @@
     CONSTRAINTS_TO_ALLOWED_SCHEMAS[constraint].update(('url', 'multi-host-url'))
 for constraint in BOOL_CONSTRAINTS:
     CONSTRAINTS_TO_ALLOWED_SCHEMAS[constraint].update(('bool',))
+for constraint in LAX_OR_STRICT_CONSTRAINTS:
+    CONSTRAINTS_TO_ALLOWED_SCHEMAS[constraint].update(('lax-or-strict',))
 
 
 def add_js_update_schema(s: cs.CoreSchema, f: Callable[[], dict[str, Any]]) -> None:

tests/test_types.py

@@ -1700,6 +1700,28 @@ class Model(BaseModel):
         ]
 
 
+def test_strict_enum() -> None:
+    class Demo(Enum):
+        A = 0
+        B = 1
+
+    class User(BaseModel):
+        model_config = ConfigDict(strict=True)
+
+        demo_strict: Demo
+        demo_not_strict: Demo = Field(strict=False)
+
+    user = User(demo_strict=Demo.A, demo_not_strict=1)
+
+    assert isinstance(user.demo_strict, Demo)
+    assert isinstance(user.demo_not_strict, Demo)
+    assert user.demo_strict.value == 0
+    assert user.demo_not_strict.value == 1
+
+    with pytest.raises(ValidationError, match='Input should be an instance of test_strict_enum.<locals>.Demo'):
+        User(demo_strict=0, demo_not_strict=1)
+
+
 @pytest.mark.parametrize(
     'kwargs,type_',
     [