Which is somewhat ironic, considering half of the reason to use it over Mori (which is better in some aspects) was that it was more maintained (Mori didn't pull anything in ages).

Now neither of them are really maintained.

For a lot of usages, something like Ramda or Lodash/FP will do the trick (Ramda lenses or Lodash/FP's get and set methods work great to handle immutable data structures), but if you really wanted structural sharing and stuff, now you're kindda stuck.