@Override
public <A> Either<S, A> mplus(_<__.µ<Either.µ, S>, A> one, _<__.µ<Either.µ, S>, A> two) {
Either<S,A> first = Either.narrow(one);
Either<S,A> second = Either.narrow(two);
if (first.isLeft()) {
return second.isRight() ? second : Either.newLeft(monoid.apply(first.getLeft(), second.getLeft()));
} else {
return second.isLeft() || bias == Bias.FIRST_RIGHT ? first : second;
}
}
@Override
public <A> Either<S, A> mzero() {
return Either.newLeft(monoid.identity());
}