Hi,

it's a key/value store, which means a Map. It is very strongly designed around the concept of Map, to provide maximum performance from it, which would require a very different design to support a distributed Queue or a Topic, so that's not planned for the near future.

Implementing List or Set is likely much easier to do; it's not on the roadmap as we didn't consider it a priority but you would be welcome to contribute such an implementation if you're interested, or simply have need for it.