interface function member declarations needing parameter attributes ?

[someone via Digitalmars-d-learn]

```d
public interface intefaceWhatever {

   public bool doSomething(
      dstring lstrID,
      classX robjX
      );
}
```

vs

```d
public interface intefaceWhatever {

   public bool doSomething(
      const dstring lstrID,
      ref classX robjX
      );

}
```

From the interface perspective: are these signatures identical or 
not ?

Is the latter needed ... or if not, makes sense as best practice ?