public static bool Is <T>(
this DomainObject domainObject
) where T : class
=> domainObject.Object is T;
public static T Cast <T>(
this DomainObject domainObject
) where T : class
=> (T)domainObject.Object;
public static T As <T>(
this DomainObject domainObject
) where T : class
=> domainObject.Object as T;