Github user bzz commented on the issue:

    https://github.com/apache/zeppelin/pull/1007
  
    Thank you for addressing feedback promptly.
    
    Well, in my oppinion, if by "encourage more versioned implementation" you 
mean having this code duplicated 5 times around the code base
    ```java
      @Override
      public Note get(String noteId, Revision rev) throws IOException {
        // Auto-generated method stub
        return null;
      }
    ```
    it looks like not very elegant solution. 
    
    It looks more meaningful and elegant to having 2 separate interfaces 
(types) documented, 1 for non-versioned backends and 1 for versioned ones to 
allow authors to choose from.
    
    Otherwise, if we extend the suggested logic - why do not just to type 
everything as `Object` and keep only 1 interface for everything? It kind of 
defeats the benefits of having a type system.
    
    It's not a strong opinion though, and if after this arguments, you still 
feel that having single one is better - please let me know.
    
    Other that this issues - it looks great to me.


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