Nice article, but I think some of the ideas need some clarification. > For example, keys of a Map object are value equality checked... This has a lot of really

Nice article, but I think some of the ideas need some clarification. > For example, keys of a Map object are value equality checked... This has a lot of really nice implications. I'm not sure how immutability helps here. And it's not possible to use reference equality, since with queries, you're converting user input into a data structure. Edit: never mind. Precisely because you're dealing with input, you have to use value-equality.