Prettyprinted diff mangled when using advanced compilation in cljs

Thanks for the awesome tool! We are currently using it in an internal web-based integration testing tool. It's working great right up until trying to display a pretty printed version of diffs.

It seems the pretty printer messes up the diff when compiled with advanced optimizations.

Here is a shell session demonstrating the problem:

❯ tree
.
├── deps.edn
└── src
    └── ddiff_bug
        └── core.cljs

3 directories, 2 files
❯ bat deps.edn 
   1   {:paths ["src"]
   2    :deps  { org.clojure/clojurescript {:mvn/version "1.11.132"}
   3            lambdaisland/deep-diff2    {:mvn/version "2.11.216"}}}
❯ bat src/ddiff_bug/core.cljs 
   1   (ns ddiff-bug.core
   2       (:require [lambdaisland.deep-diff2 :as ddiff]))
   3
   4   
   5   (enable-console-print!)
   6   
   7   (defn diff-view
   8     [a b]
   9     (let [diff    (ddiff/diff a b)
  10           diffstr (with-out-str (ddiff/pretty-print diff))]
  11       (println "\nDocument A")
  12       (println a)
  13       (println "\nDocument B")
  14       (println b)
  15       (println "\nDiff")
  16       (println diff)
  17       (println "\nPretty printed diff")
  18       (println diffstr)))
  19   
  20   (defn -main
  21     [& args]
  22     (diff-view {"Hi" {:foo 424128, :bar 22140, :baz 243000}}
  23                {"Ho" {:foo 424128, :bar 22140, :baz 243000}}))
  24   
  25   
  26   (-main)
  27   
❯ clj -M --main cljs.main --target node --output-to main-dev.js --optimizations none --compile ddiff-bug.core

❯ clj -M --main cljs.main --target node --output-to main-prod.js --optimizations advanced --compile ddiff-bug.core

❯ node main-dev.js

Document A
{Hi {:foo 424128, :bar 22140, :baz 243000}}

Document B
{Ho {:foo 424128, :bar 22140, :baz 243000}}

Diff
{#lambdaisland.deep-diff2.diff-impl.Deletion{:- Hi} {:foo 424128, :bar 22140, :baz 243000}, #lambdaisland.deep-diff2.diff-impl.Insertion{:+ Ho} {:foo 424128, :bar 22140, :baz 243000}}

Pretty printed diff
{+"Ho" {:bar 22140, :baz 243000, :foo 424128}, -"Hi" {:bar 22140, :baz 243000, :foo 424128}}

❯ node main-prod.js 

Document A
{Hi {:foo 424128, :bar 22140, :baz 243000}}

Document B
{Ho {:foo 424128, :bar 22140, :baz 243000}}

Diff
{#lambdaisland.deep-diff2.diff-impl.Deletion{:- Hi} {:foo 424128, :bar 22140, :baz 243000}, #lambdaisland.deep-diff2.diff-impl.Insertion{:+ Ho} {:foo 424128, :bar 22140, :baz 243000}}

Pretty printed diff
{#Xo {:+ "Ho"} {:bar 22140, :baz 243000, :foo 424128},
 #Wo {:- "Hi"} {:bar 22140, :baz 243000, :foo 424128}}

It seems minimized names (as seen in the Xo and Wo tags here) are confusing the printer. The two tags seen here are minimized versions of $lambdaisland$deep_diff2$diff_impl$Insertion$$ and $lambdaisland$deep_diff2$diff_impl$Deletion$$

src/ddiff_bug/core.cljs と deps.edn から始め、次に --optimizations none と advanced を指定して 2 つの cljs.main コマンドを実行し、差異を再現します。ddiff/pretty-print のエントリーポイントを追跡し、得られた出力を比較します。advanced ビルドが非最適化ビルドと同じ読みやすい挿入タグと削除タグを出力すれば完了です。