code: public static <L, R> Lens.Simple<Either<L, R>, Maybe<R>> right() {
          return simpleLens(CoProduct2::projectB, (lOrR, maybeR) -> maybeR.<Either<L, R>>fmap(Either::right).orElse(lOrR));
      }
docs: Convenience static factory method for creating a lens over right values, wrapping them in a {@link Maybe}. When
  setting, a {@link Maybe#nothing()} value means to leave the {@link Either} unaltered, where as a
  {@link Maybe#just} value replaces the either with a right over the {@link Maybe}.
  <p>
  Note that this lens is NOT lawful, since "you get back what you put in" fails for {@link Maybe#nothing()}.
  
  @param <L> the left parameter type
  @param <R> the right parameter type
  @return a lens that focuses on right values