I don’t think this holds for persistent data structures that use HAMT. Those have great performance along with the benefits of immutability, and I’m perfectly

I don’t think this holds for persistent data structures that use HAMT. Those have great performance along with the benefits of immutability, and I’m perfectly okay with deferring order to a pretty-printer. It wouldn’t handle insertion order, probably best to do alphabetical by default then. Chrome dec tools does this for js objects (which are map-like) already, and I’ve never had complaints about it.