ModelAdmin extra_context should be Dict[str, Any]

[andreymal]

Because it's passed into templates context (see Django code). I use overridden templates and pass some objects to them using extra_context.

django-stubs/django-stubs/contrib/admin/options.pyi

Lines 250 to 264 in cc5d363

	extra_context: Optional[Dict[str, bool]] = ...,
	) -> Any: ...
	def autocomplete_view(self, request: HttpRequest) -> JsonResponse: ...
	def add_view(self, request: HttpRequest, form_url: str = ..., extra_context: None = ...) -> HttpResponse: ...
	def change_view(
	self, request: HttpRequest, object_id: str, form_url: str = ..., extra_context: Optional[Dict[str, bool]] = ...
	) -> HttpResponse: ...
	def changelist_view(
	self, request: HttpRequest, extra_context: Optional[Dict[str, str]] = ...
	) -> TemplateResponse: ...
	def get_deleted_objects(
	self, objs: QuerySet, request: HttpRequest
	) -> Tuple[List[Any], Dict[Any, Any], Set[Any], List[Any]]: ...
	def delete_view(self, request: HttpRequest, object_id: str, extra_context: None = ...) -> Any: ...
	def history_view(self, request: HttpRequest, object_id: str, extra_context: None = ...) -> HttpResponse: ...

[sobolevn]

@andreymal please, feel free to submit a PR.

[andreymal]

Oh, there is an issue #355 which replaces Dict with Mapping

But Django does not allow any mapping other than dict, so I'm not sure I'm able to make a proper PR :(