diff --git a/flake.lock b/flake.lock
index e7788c60..5a357a75 100644
--- a/flake.lock
+++ b/flake.lock
@@ -23,11 +23,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1759362264,
-        "narHash": "sha256-wfG0S7pltlYyZTM+qqlhJ7GMw2fTF4mLKCIVhLii/4M=",
+        "lastModified": 1760948891,
+        "narHash": "sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "758cf7296bee11f1706a574c77d072b8a7baa881",
+        "rev": "864599284fc7c0ba6357ed89ed5e2cd5040f0c04",
         "type": "github"
       },
       "original": {
@@ -53,11 +53,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1759386674,
-        "narHash": "sha256-wg1Lz/1FC5Q13R+mM5a2oTV9TA9L/CHHTm3/PiLayfA=",
+        "lastModified": 1761880412,
+        "narHash": "sha256-QoJjGd4NstnyOG4mm4KXF+weBzA2AH/7gn1Pmpfcb0A=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "625ad6366178f03acd79f9e3822606dd7985b657",
+        "rev": "a7fc11be66bdfb5cdde611ee5ce381c183da8386",
         "type": "github"
       },
       "original": {
diff --git a/lib/types/custom.nix b/lib/types/custom.nix
index c42cd2ce..8e8be8a2 100644
--- a/lib/types/custom.nix
+++ b/lib/types/custom.nix
@@ -3,13 +3,11 @@
   inherit (lib.strings) isString stringLength match;
   inherit (lib.types) listOf mkOptionType;
 in {
-  mergelessListOf = elemType: let
-    super = listOf elemType;
-  in
-    super
-    // {
+  mergelessListOf = elemType:
+    mkOptionType {
       name = "mergelessListOf";
-      description = "mergeless ${super.description}";
+      description = "mergeless list of ${elemType.description or "values"}";
+      inherit (lib.types.listOf elemType) check;
       merge = mergeEqualOption;
     };
 
diff --git a/lib/types/dag.nix b/lib/types/dag.nix
index a42ed513..6d289e27 100644
--- a/lib/types/dag.nix
+++ b/lib/types/dag.nix
@@ -62,7 +62,13 @@ in rec {
       inherit (elemType) getSubModules;
       getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
       substSubModules = m: dagOf (elemType.substSubModules m);
-      functor = (defaultFunctor name) // {wrapped = elemType;};
+      functor = {
+        name = name;
+        type = dagOf;
+        wrapped = elemType;
+        payload = elemType;
+        binOp = a: b: a;
+      };
       nestedTypes.elemType = elemType;
     };
 }