Merge pull request #235197 from hercules-ci/simplify-concatMapAttrs-trace

         { x = "a"; y = "b"; }

       => { x = "a"; xa = "a"; y = "b"; yb = "b"; }

  */

  concatMapAttrs = f: flip pipe [ (mapAttrs f) attrValues (foldl' mergeAttrs { }) ];

  concatMapAttrs = f: v:

    foldl' mergeAttrs { }

      (attrValues

        (mapAttrs f v)

      );

  /* Update or set specific paths of an attribute set.