Merge pull request #290946 from ju1m/systemd-option-list

nixos/systemd: merge unit options as lists when at least one value is a list

nixos/lib/systemd-unit-options.nix

@@ -21,14 +21,8 @@ in rec {
       let
         defs' = filterOverrides defs;
       in
-        if isList (head defs').value
-        then concatMap (def:
-          if builtins.typeOf def.value == "list"
-          then def.value
-          else
-            throw "The definitions for systemd unit options should be either all lists, representing repeatable options, or all non-lists, but for the option ${showOption loc}, the definitions are a mix of list and non-list ${lib.options.showDefs defs'}"
-        ) defs'
-
+        if any (def: isList def.value) defs'
+        then concatMap (def: toList def.value) defs'
         else mergeEqualOption loc defs';
   };