Object as function argument

[Chris Sperandio via Digitalmars-d-learn]

Ok... So, in D when I work with Object, it's like if I work with 
only pointers.
Thus, I can return null from a function which returns an Item 
instance.
Is it clean to write this code below ?

   static Item nullReturn(Item item)
   {
    // ...
    // and for some cases
     return null;
   }