Close this store and release any resources.
Close this store and release any resources. It is undefined what happens if you merge after close
sets to .
sets to .plus(get(kv._1).get.getOrElse(monoid.zero), kv._2) but maybe more efficient implementations
merge a set of keys.
merge a set of keys.
The semigroup equivalent to the merge operation of this store
The semigroup equivalent to the merge operation of this store