os/lib/recursive-merge.nix

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{ lib }:
attrList:
let
f = attrPath:
zipAttrsWith (
n: values:
if tail values == []
then head values
else if all isList values
then unique (concatLists values)
else if all isAttrs values
then f (attrPath ++ [n]) values
else last values
);
in
f [] attrList;