Diffing sets doesn’t deep-diff

When diffing a set, i.e.

(ddiff/diff
 #{{:db/id 17592186065894
    :test "1"}}
 #{{:db/id 17592186065894
    :test "2"}
   {:db/id 13194139559179
    :db/txInstant #inst "2025-05-20T07:41:40.877-00:00"}})

the result is:

#{{:+
   {:db/id 13194139559179,
    :db/txInstant #inst "2025-05-20T07:41:40.877000000-00:00"}}
  {:+ {:db/id 17592186065894, :test "2"}}
  {:- {:db/id 17592186065894, :test "1"}}}

I would expect the result to be similar to a vector, i.e.

(ddiff/diff
 [{:db/id 17592186065894
   :test "1"}]
 [{:db/id 17592186065894
   :test "2"}
  {:db/id 13194139559179
   :db/txInstant #inst "2025-05-20T07:41:40.877-00:00"}])

produces:

[{:db/id 17592186065894, :test {:- "1", :+ "2"}}
 {:+
  {:db/id 13194139559179,
   :db/txInstant #inst "2025-05-20T07:41:40.877000000-00:00"}}]

Digging deeper, it looks like there is bug with set diffing in general:

I.e.

(ddiff/diff #{{:id 123 :foo :bar}} #{{:id 123 :foo :baz}})

produces:

#{{:+ {:id 123, :foo :baz}} {:- {:id 123, :foo :bar}}}

where using a vector produces:

[{:id 123, :foo {:- :bar, :+ :baz}}]

Start by reproducing the ddiff/diff examples for sets and vectors, then compare how nested maps are matched in each case. Done means set diffing reports changed fields inside matching maps while still reporting genuinely added or removed elements correctly.