Union/sum types don't combine things though? you can only have ever one variant at a time. it's a misnomer. monads and monoids combine things in the sense of jo

Union/sum types don't combine things though? you can only have ever one variant at a time. it's a misnomer. monads and monoids combine things in the sense of joining them. e.g. lists are a monoid because you can concatenate (they're also a monad for the same reason).