fix #925

CHANGELOG.md

@@ -14,6 +14,10 @@ We use [Break Versioning][breakver]. The version numbers follow a `<major>.<mino
 
 Malli is in well matured [alpha](README.md#alpha).
 
+## UNRELEASED
+
+*  FIX: retain order with `:catn` unparse, fixes [#925](https://github.com/metosin/malli/issues/925)
+
 ## 0.11.0 (2023-04-12)
 
 * BREAKING: remove map syntax: `mu/from-map-syntax`, `mu/to-map-syntax`. Note that AST syntax and lite syntax remain unchanged.

src/malli/impl/regex.cljc

@@ -192,7 +192,7 @@
         :malli.core/invalid))))
 
 (defn catn-unparser [& unparsers]
-  (let [unparsers (into {} unparsers)]
+  (let [unparsers (apply array-map (mapcat identity unparsers))]
     (fn [m]
       (if (and (map? m) (= (count m) (count unparsers)))
         (miu/-reduce-kv-valid (fn [coll tag unparser]

test/malli/core_test.cljc

@@ -2959,3 +2959,18 @@
                        (prefixer "g")
                        (prefixer "h")
                        (prefixer "i")) "xxx"))))))
+
+(deftest -issue-925-test
+  (testing "order is retained with catn parse+unparse"
+    (let [schema [:catn
+                  [:a :int]
+                  [:b :int]
+                  [:c :int]
+                  [:d :int]
+                  [:e :int]
+                  [:f :int]
+                  [:g :int]
+                  [:h :int]
+                  [:i :int]]
+          input [1 2 3 4 5 6 7 8 9]]
+      (is (= input (->> input (m/parse schema) (m/unparse schema)))))))