remove non-model overload for Field descriptor (#4)

(not upstreamed)

hopefully eventually can remove when python/mypy#5570 is solved

django-stubs/db/models/fields/__init__.pyi

@@ -184,10 +184,7 @@ class Field(RegisterLookupMixin, Generic[_ST, _GT]):
     def __get__(self, instance: None, owner: Any) -> _FieldDescriptor[Self]: ...
     # Model instance access
     @overload
-    def __get__(self, instance: Model, owner: Any) -> _GT: ...
-    # non-Model instances
-    @overload
-    def __get__(self, instance: Any, owner: Any) -> Self: ...
+    def __get__(self, instance: object, owner: Any) -> _GT: ...
     def deconstruct(self) -> tuple[str, str, Sequence[Any], dict[str, Any]]: ...
     def set_attributes_from_name(self, name: str) -> None: ...
     def db_type_parameters(self, connection: BaseDatabaseWrapper) -> DictWrapper: ...

django-stubs/db/models/fields/files.pyi

@@ -13,7 +13,6 @@ from django.db.models.utils import AltersData
 from django.utils._os import _PathCompatible
 from django.utils.choices import _Choices
 from django.utils.functional import _StrOrPromise
-from typing_extensions import Self
 
 class FieldFile(File, AltersData):
     instance: Model
@@ -85,10 +84,7 @@ class FileField(Field):
     def __get__(self, instance: None, owner: Any) -> FileDescriptor: ...
     # Model instance access
     @overload
-    def __get__(self, instance: Model, owner: Any) -> Any: ...
-    # non-Model instances
-    @overload
-    def __get__(self, instance: Any, owner: Any) -> Self: ...
+    def __get__(self, instance: object, owner: Any) -> Any: ...
     def generate_filename(self, instance: Model | None, filename: _PathCompatible) -> str: ...
 
 class ImageFileDescriptor(FileDescriptor):
@@ -113,8 +109,5 @@ class ImageField(FileField):
     def __get__(self, instance: None, owner: Any) -> ImageFileDescriptor: ...
     # Model instance access
     @overload
-    def __get__(self, instance: Model, owner: Any) -> Any: ...
-    # non-Model instances
-    @overload
-    def __get__(self, instance: Any, owner: Any) -> Self: ...
+    def __get__(self, instance: object, owner: Any) -> Any: ...
     def update_dimension_fields(self, instance: Model, force: bool = ..., *args: Any, **kwargs: Any) -> None: ...

django-stubs/db/models/fields/related.pyi

@@ -129,10 +129,7 @@ class ForeignObject(RelatedField[_ST, _GT]):
     def __get__(self, instance: None, owner: Any) -> ForwardManyToOneDescriptor[Self]: ...
     # Model instance access
     @overload
-    def __get__(self, instance: Model, owner: Any) -> _GT: ...
-    # non-Model instances
-    @overload
-    def __get__(self, instance: Any, owner: Any) -> Self: ...
+    def __get__(self, instance: object, owner: Any) -> _GT: ...
     def resolve_related_fields(self) -> list[tuple[Field, Field]]: ...
     @cached_property
     def related_fields(self) -> list[tuple[Field, Field]]: ...
@@ -231,10 +228,7 @@ class OneToOneField(ForeignKey[_ST, _GT]):
     def __get__(self, instance: None, owner: Any) -> ForwardOneToOneDescriptor[Self]: ...
     # Model instance access
     @overload
-    def __get__(self, instance: Model, owner: Any) -> _GT: ...
-    # non-Model instances
-    @overload
-    def __get__(self, instance: Any, owner: Any) -> Self: ...
+    def __get__(self, instance: object, owner: Any) -> _GT: ...
 
 _Through = TypeVar("_Through", bound=Model)
 _To = TypeVar("_To", bound=Model)
@@ -290,10 +284,7 @@ class ManyToManyField(RelatedField[Any, Any], Generic[_To, _Through]):
     def __get__(self, instance: None, owner: Any) -> ManyToManyDescriptor[_To, _Through]: ...
     # Model instance access
     @overload
-    def __get__(self, instance: Model, owner: Any) -> ManyRelatedManager[_To, _Through]: ...
-    # non-Model instances
-    @overload
-    def __get__(self, instance: Any, owner: Any) -> Self: ...
+    def __get__(self, instance: object, owner: Any) -> ManyRelatedManager[_To, _Through]: ...
     def get_path_info(self, filtered_relation: FilteredRelation | None = ...) -> list[PathInfo]: ...
     def get_reverse_path_info(self, filtered_relation: FilteredRelation | None = ...) -> list[PathInfo]: ...
     def contribute_to_related_class(self, cls: type[Model], related: RelatedField) -> None: ...