Try #1476:

Author: iohk-bors[bot]

modules/plan.nix

@@ -155,7 +155,7 @@ let
 
     enableSeparateDataOutput = mkOption {
       type = bool;
-      default = (def.enableSeparateDataOutput or false);
+      default = (def.enableSeparateDataOutput or true);
     };
 
     enableProfiling = mkOption {

release.nix

@@ -1,7 +1,7 @@
 # 'supportedSystems' restricts the set of systems that we will evaluate for. Useful when you're evaluating
 # on a machine with e.g. no way to build the Darwin IFDs you need!
 { supportedSystems ? [ "x86_64-linux" "x86_64-darwin" ]
-, ifdLevel ? 3
+, ifdLevel ? 2
 , checkMaterialization ? false }:
 
 let