code: @Override
      public <R> Future<R> map(final Function<? super T, ? extends R> fn) {
          return new Future<R>(
                                future.thenApply(fn));
      }
docs: /*
  (non-Javadoc)
  
  @see
  com.oath.cyclops.types.ConvertableFunctor#transform(java.util.function.Function)