Why is NonFungibleTokenContract final?


  I am extending NonFungibleToken to MyNonFungibleToken for example. But I cannot have the corresponding MyNonFungibleTokenContract extend NonFungibleTokenContract because it is final. Does that mean I have to write MyNonFungibleTokenContract from scratch? I guess I can extend AbstractTokenContract just as NonFungibleTokenContract does. Is that the recommended approach?
  BTW, FungibleTokenContract is open. I wonder why the disparity.


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