error:
       … while calling the 'genericClosure' builtin
         at /pwd/lang/eval-fail-genericClosure-keys-incompatible-types.nix:1:1:
            1| builtins.genericClosure {
             | ^
            2|   startSet = [

       … while comparing element { key = "string"; }

       … with element { key = 1; }

       error: cannot compare a string with an integer; values are "string" and 1
