code: @Override
      @SuppressWarnings("unchecked")
      public <B, App extends Applicative<?, App>, TravB extends Traversable<B, Identity<?>>,
              AppB extends Applicative<B, App>,
              AppTrav extends Applicative<TravB, App>> AppTrav traverse(Function<? super A, ? extends AppB> fn,
                                                                        Function<? super TravB, ? extends AppTrav> pure) {
          return (AppTrav) fn.apply(runIdentity()).fmap(Identity::new);
      }
docs: {@inheritDoc}