src/vs/workbench/contrib/notebook/browser/notebookServiceImpl.ts/NotebookProviderInfoStore/_convertPriority
class NotebookProviderInfoStore:	private _convertPriority(priority?: string) {
		if (!priority) {
			return RegisteredEditorPriority.default;
		}

		if (priority === NotebookEditorPriority.default) {
			return RegisteredEditorPriority.default;
		}

		return RegisteredEditorPriority.option;

	}